diff --git a/cirq-google/cirq_google/api/v2/program.proto b/cirq-google/cirq_google/api/v2/program.proto
index 0326e482f73..2dea102fed2 100644
--- a/cirq-google/cirq_google/api/v2/program.proto
+++ b/cirq-google/cirq_google/api/v2/program.proto
@@ -215,8 +215,32 @@ message WaitGate {
   FloatArg duration_nanos = 1;
 }
 
+// Representation of cirq.DepolarizingChannel
+message DepolarizingChannel {
+  FloatArg probability = 1;
+  int32 num_qubits = 2;
+}
+
+// Representation of cirq.RandomGateChannel
+message RandomGateChannel {
+  FloatArg probability = 1;
+  Operation sub_gate = 2;
+}
+
+// Representation of noisy channels
+// These should only be used for serialization
+// of noisy circuits for simulation.
+// These channels would generally not be supported
+// by hardware.
+message NoiseChannel {
+  oneof channel_value {
+    DepolarizingChannel depolarizingchannel = 1;
+    RandomGateChannel randomgatechannel = 2;
+  }
+}
+
 // An operation acts on a set of qubits.
-// next available id = 27
+// next available id = 28
 message Operation {
   // Previously deprecated fields.  Do not use.
   reserved 1, 2;
@@ -241,6 +265,7 @@ message Operation {
     SingleQubitCliffordGate singlequbitcliffordgate = 21;
     ResetGate resetgate = 24;
     ISwapLikeGate iswaplikegate = 26;
+    NoiseChannel noisechannel = 27;
   }
 
   // Which qubits the operation acts on.
diff --git a/cirq-google/cirq_google/api/v2/program_pb2.py b/cirq-google/cirq_google/api/v2/program_pb2.py
index 3e662b06a54..1d52d97dcfc 100644
--- a/cirq-google/cirq_google/api/v2/program_pb2.py
+++ b/cirq-google/cirq_google/api/v2/program_pb2.py
@@ -16,7 +16,7 @@
 from . import ndarrays_pb2 as cirq__google_dot_api_dot_v2_dot_ndarrays__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n cirq_google/api/v2/program.proto\x12\x12\x63irq.google.api.v2\x1a\x19tunits/proto/tunits.proto\x1a!cirq_google/api/v2/ndarrays.proto\"\xaf\x01\n\x07Program\x12\x32\n\x08language\x18\x01 \x01(\x0b\x32\x1c.cirq.google.api.v2.LanguageB\x02\x18\x01\x12.\n\x07\x63ircuit\x18\x02 \x01(\x0b\x32\x1b.cirq.google.api.v2.CircuitH\x00\x12/\n\tconstants\x18\x04 \x03(\x0b\x32\x1c.cirq.google.api.v2.ConstantB\t\n\x07programJ\x04\x08\x03\x10\x04\"\xaf\x02\n\x08\x43onstant\x12\x16\n\x0cstring_value\x18\x01 \x01(\tH\x00\x12\x34\n\rcircuit_value\x18\x02 \x01(\x0b\x32\x1b.cirq.google.api.v2.CircuitH\x00\x12*\n\x05qubit\x18\x03 \x01(\x0b\x32\x19.cirq.google.api.v2.QubitH\x00\x12\x32\n\x0cmoment_value\x18\x04 \x01(\x0b\x32\x1a.cirq.google.api.v2.MomentH\x00\x12\x38\n\x0foperation_value\x18\x05 \x01(\x0b\x32\x1d.cirq.google.api.v2.OperationH\x00\x12,\n\ttag_value\x18\x06 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 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -84,96 +84,102 @@
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   _globals['_WAITGATE']._serialized_start=2192
   _globals['_WAITGATE']._serialized_end=2256
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-  _globals['_NOSYNCTAG']._serialized_start=4093
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-  _globals['_INTERNALTAG']._serialized_start=4228
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-  _globals['_INTERNALTAG_TAGARGSENTRY']._serialized_start=4416
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-  _globals['_INTERNALTAG_CUSTOMARGSENTRY']._serialized_start=4489
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-  _globals['_QUBITMAPPING_QUBITENTRY']._serialized_start=7234
-  _globals['_QUBITMAPPING_QUBITENTRY']._serialized_end=7328
-  _globals['_MEASUREMENTKEY']._serialized_start=7330
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-  _globals['_MEASUREMENTKEYMAPPING_MEASUREMENTKEYENTRY']._serialized_start=7518
-  _globals['_MEASUREMENTKEYMAPPING_MEASUREMENTKEYENTRY']._serialized_end=7639
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-  _globals['_CUSTOMARG']._serialized_start=7873
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-  _globals['_COUPLERPULSEGATE']._serialized_start=8344
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-  _globals['_SINGLEQUBITCLIFFORDGATE']._serialized_start=8960
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-  _globals['_IDENTITYGATE']._serialized_start=9041
-  _globals['_IDENTITYGATE']._serialized_end=9074
-  _globals['_HPOWGATE']._serialized_start=9076
-  _globals['_HPOWGATE']._serialized_end=9134
-  _globals['_RESETGATE']._serialized_start=9137
-  _globals['_RESETGATE']._serialized_end=9308
-  _globals['_RESETGATE_ARGUMENTSENTRY']._serialized_start=9235
-  _globals['_RESETGATE_ARGUMENTSENTRY']._serialized_end=9308
+  _globals['_DEPOLARIZINGCHANNEL']._serialized_start=2258
+  _globals['_DEPOLARIZINGCHANNEL']._serialized_end=2350
+  _globals['_RANDOMGATECHANNEL']._serialized_start=2352
+  _globals['_RANDOMGATECHANNEL']._serialized_end=2471
+  _globals['_NOISECHANNEL']._serialized_start=2474
+  _globals['_NOISECHANNEL']._serialized_end=2645
+  _globals['_OPERATION']._serialized_start=2648
+  _globals['_OPERATION']._serialized_end=3961
+  _globals['_DYNAMICALDECOUPLINGTAG']._serialized_start=3963
+  _globals['_DYNAMICALDECOUPLINGTAG']._serialized_end=4023
+  _globals['_TAG']._serialized_start=4026
+  _globals['_TAG']._serialized_end=4464
+  _globals['_PHASEMATCHTAG']._serialized_start=4466
+  _globals['_PHASEMATCHTAG']._serialized_end=4481
+  _globals['_PHYSICALZTAG']._serialized_start=4483
+  _globals['_PHYSICALZTAG']._serialized_end=4497
+  _globals['_CLASSICALSTATETAG']._serialized_start=4499
+  _globals['_CLASSICALSTATETAG']._serialized_end=4518
+  _globals['_FSIMVIAMODELTAG']._serialized_start=4520
+  _globals['_FSIMVIAMODELTAG']._serialized_end=4537
+  _globals['_NOSYNCTAG']._serialized_start=4540
+  _globals['_NOSYNCTAG']._serialized_end=4672
+  _globals['_INTERNALTAG']._serialized_start=4675
+  _globals['_INTERNALTAG']._serialized_end=5016
+  _globals['_INTERNALTAG_TAGARGSENTRY']._serialized_start=4863
+  _globals['_INTERNALTAG_TAGARGSENTRY']._serialized_end=4934
+  _globals['_INTERNALTAG_CUSTOMARGSENTRY']._serialized_start=4936
+  _globals['_INTERNALTAG_CUSTOMARGSENTRY']._serialized_end=5016
+  _globals['_GATE']._serialized_start=5018
+  _globals['_GATE']._serialized_end=5036
+  _globals['_QUBIT']._serialized_start=5038
+  _globals['_QUBIT']._serialized_end=5057
+  _globals['_ARG']._serialized_start=5060
+  _globals['_ARG']._serialized_end=5279
+  _globals['_ARGVALUE']._serialized_start=5282
+  _globals['_ARGVALUE']._serialized_end=5862
+  _globals['_REPEATEDINT64']._serialized_start=5864
+  _globals['_REPEATEDINT64']._serialized_end=5895
+  _globals['_REPEATEDDOUBLE']._serialized_start=5897
+  _globals['_REPEATEDDOUBLE']._serialized_end=5929
+  _globals['_REPEATEDSTRING']._serialized_start=5931
+  _globals['_REPEATEDSTRING']._serialized_end=5963
+  _globals['_REPEATEDBOOLEAN']._serialized_start=5965
+  _globals['_REPEATEDBOOLEAN']._serialized_end=5998
+  _globals['_TUPLE']._serialized_start=6001
+  _globals['_TUPLE']._serialized_end=6190
+  _globals['_TUPLE_SEQUENCETYPE']._serialized_start=6114
+  _globals['_TUPLE_SEQUENCETYPE']._serialized_end=6190
+  _globals['_COMPLEX']._serialized_start=6192
+  _globals['_COMPLEX']._serialized_end=6241
+  _globals['_NDARRAY']._serialized_start=6244
+  _globals['_NDARRAY']._serialized_end=6889
+  _globals['_ARGFUNCTION']._serialized_start=6891
+  _globals['_ARGFUNCTION']._serialized_end=6957
+  _globals['_CIRCUITOPERATION']._serialized_start=6960
+  _globals['_CIRCUITOPERATION']._serialized_end=7409
+  _globals['_REPETITIONSPECIFICATION']._serialized_start=7412
+  _globals['_REPETITIONSPECIFICATION']._serialized_end=7600
+  _globals['_REPETITIONSPECIFICATION_REPETITIONIDS']._serialized_start=7552
+  _globals['_REPETITIONSPECIFICATION_REPETITIONIDS']._serialized_end=7580
+  _globals['_QUBITMAPPING']._serialized_start=7603
+  _globals['_QUBITMAPPING']._serialized_end=7775
+  _globals['_QUBITMAPPING_QUBITENTRY']._serialized_start=7681
+  _globals['_QUBITMAPPING_QUBITENTRY']._serialized_end=7775
+  _globals['_MEASUREMENTKEY']._serialized_start=7777
+  _globals['_MEASUREMENTKEY']._serialized_end=7857
+  _globals['_MEASUREMENTKEYMAPPING']._serialized_start=7860
+  _globals['_MEASUREMENTKEYMAPPING']._serialized_end=8086
+  _globals['_MEASUREMENTKEYMAPPING_MEASUREMENTKEYENTRY']._serialized_start=7965
+  _globals['_MEASUREMENTKEYMAPPING_MEASUREMENTKEYENTRY']._serialized_end=8086
+  _globals['_ARGMAPPING']._serialized_start=8089
+  _globals['_ARGMAPPING']._serialized_end=8249
+  _globals['_ARGMAPPING_ARGENTRY']._serialized_start=8161
+  _globals['_ARGMAPPING_ARGENTRY']._serialized_end=8249
+  _globals['_FUNCTIONINTERPOLATION']._serialized_start=8251
+  _globals['_FUNCTIONINTERPOLATION']._serialized_end=8318
+  _globals['_CUSTOMARG']._serialized_start=8320
+  _globals['_CUSTOMARG']._serialized_end=8427
+  _globals['_INTERNALGATE']._serialized_start=8430
+  _globals['_INTERNALGATE']._serialized_end=8788
+  _globals['_INTERNALGATE_GATEARGSENTRY']._serialized_start=8634
+  _globals['_INTERNALGATE_GATEARGSENTRY']._serialized_end=8706
+  _globals['_INTERNALGATE_CUSTOMARGSENTRY']._serialized_start=4936
+  _globals['_INTERNALGATE_CUSTOMARGSENTRY']._serialized_end=5016
+  _globals['_COUPLERPULSEGATE']._serialized_start=8791
+  _globals['_COUPLERPULSEGATE']._serialized_end=9263
+  _globals['_CLIFFORDTABLEAU']._serialized_start=9266
+  _globals['_CLIFFORDTABLEAU']._serialized_end=9405
+  _globals['_SINGLEQUBITCLIFFORDGATE']._serialized_start=9407
+  _globals['_SINGLEQUBITCLIFFORDGATE']._serialized_end=9486
+  _globals['_IDENTITYGATE']._serialized_start=9488
+  _globals['_IDENTITYGATE']._serialized_end=9521
+  _globals['_HPOWGATE']._serialized_start=9523
+  _globals['_HPOWGATE']._serialized_end=9581
+  _globals['_RESETGATE']._serialized_start=9584
+  _globals['_RESETGATE']._serialized_end=9755
+  _globals['_RESETGATE_ARGUMENTSENTRY']._serialized_start=9682
+  _globals['_RESETGATE_ARGUMENTSENTRY']._serialized_end=9755
 # @@protoc_insertion_point(module_scope)
diff --git a/cirq-google/cirq_google/api/v2/program_pb2.pyi b/cirq-google/cirq_google/api/v2/program_pb2.pyi
index bbe7c2f43ce..d47dc4be301 100644
--- a/cirq-google/cirq_google/api/v2/program_pb2.pyi
+++ b/cirq-google/cirq_google/api/v2/program_pb2.pyi
@@ -546,10 +546,84 @@ class WaitGate(google.protobuf.message.Message):
 
 global___WaitGate = WaitGate
 
+@typing.final
+class DepolarizingChannel(google.protobuf.message.Message):
+    """Representation of cirq.DepolarizingChannel"""
+
+    DESCRIPTOR: google.protobuf.descriptor.Descriptor
+
+    PROBABILITY_FIELD_NUMBER: builtins.int
+    NUM_QUBITS_FIELD_NUMBER: builtins.int
+    num_qubits: builtins.int
+    @property
+    def probability(self) -> global___FloatArg: ...
+    def __init__(
+        self,
+        *,
+        probability: global___FloatArg | None = ...,
+        num_qubits: builtins.int = ...,
+    ) -> None: ...
+    def HasField(self, field_name: typing.Literal["probability", b"probability"]) -> builtins.bool: ...
+    def ClearField(self, field_name: typing.Literal["num_qubits", b"num_qubits", "probability", b"probability"]) -> None: ...
+
+global___DepolarizingChannel = DepolarizingChannel
+
+@typing.final
+class RandomGateChannel(google.protobuf.message.Message):
+    """Representation of cirq.RandomGateChannel"""
+
+    DESCRIPTOR: google.protobuf.descriptor.Descriptor
+
+    PROBABILITY_FIELD_NUMBER: builtins.int
+    SUB_GATE_FIELD_NUMBER: builtins.int
+    @property
+    def probability(self) -> global___FloatArg: ...
+    @property
+    def sub_gate(self) -> global___Operation: ...
+    def __init__(
+        self,
+        *,
+        probability: global___FloatArg | None = ...,
+        sub_gate: global___Operation | None = ...,
+    ) -> None: ...
+    def HasField(self, field_name: typing.Literal["probability", b"probability", "sub_gate", b"sub_gate"]) -> builtins.bool: ...
+    def ClearField(self, field_name: typing.Literal["probability", b"probability", "sub_gate", b"sub_gate"]) -> None: ...
+
+global___RandomGateChannel = RandomGateChannel
+
+@typing.final
+class NoiseChannel(google.protobuf.message.Message):
+    """Representation of noisy channels
+    These should only be used for serialization
+    of noisy circuits for simulation.
+    These channels would generally not be supported
+    by hardware.
+    """
+
+    DESCRIPTOR: google.protobuf.descriptor.Descriptor
+
+    DEPOLARIZINGCHANNEL_FIELD_NUMBER: builtins.int
+    RANDOMGATECHANNEL_FIELD_NUMBER: builtins.int
+    @property
+    def depolarizingchannel(self) -> global___DepolarizingChannel: ...
+    @property
+    def randomgatechannel(self) -> global___RandomGateChannel: ...
+    def __init__(
+        self,
+        *,
+        depolarizingchannel: global___DepolarizingChannel | None = ...,
+        randomgatechannel: global___RandomGateChannel | None = ...,
+    ) -> None: ...
+    def HasField(self, field_name: typing.Literal["channel_value", b"channel_value", "depolarizingchannel", b"depolarizingchannel", "randomgatechannel", b"randomgatechannel"]) -> builtins.bool: ...
+    def ClearField(self, field_name: typing.Literal["channel_value", b"channel_value", "depolarizingchannel", b"depolarizingchannel", "randomgatechannel", b"randomgatechannel"]) -> None: ...
+    def WhichOneof(self, oneof_group: typing.Literal["channel_value", b"channel_value"]) -> typing.Literal["depolarizingchannel", "randomgatechannel"] | None: ...
+
+global___NoiseChannel = NoiseChannel
+
 @typing.final
 class Operation(google.protobuf.message.Message):
     """An operation acts on a set of qubits.
-    next available id = 27
+    next available id = 28
     """
 
     DESCRIPTOR: google.protobuf.descriptor.Descriptor
@@ -571,6 +645,7 @@ class Operation(google.protobuf.message.Message):
     SINGLEQUBITCLIFFORDGATE_FIELD_NUMBER: builtins.int
     RESETGATE_FIELD_NUMBER: builtins.int
     ISWAPLIKEGATE_FIELD_NUMBER: builtins.int
+    NOISECHANNEL_FIELD_NUMBER: builtins.int
     QUBITS_FIELD_NUMBER: builtins.int
     QUBIT_CONSTANT_INDEX_FIELD_NUMBER: builtins.int
     TOKEN_VALUE_FIELD_NUMBER: builtins.int
@@ -615,6 +690,8 @@ class Operation(google.protobuf.message.Message):
     @property
     def iswaplikegate(self) -> global___ISwapLikeGate: ...
     @property
+    def noisechannel(self) -> global___NoiseChannel: ...
+    @property
     def qubits(self) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[global___Qubit]:
         """Which qubits the operation acts on.
         Operations should populate one of the following two
@@ -661,6 +738,7 @@ class Operation(google.protobuf.message.Message):
         singlequbitcliffordgate: global___SingleQubitCliffordGate | None = ...,
         resetgate: global___ResetGate | None = ...,
         iswaplikegate: global___ISwapLikeGate | None = ...,
+        noisechannel: global___NoiseChannel | None = ...,
         qubits: collections.abc.Iterable[global___Qubit] | None = ...,
         qubit_constant_index: collections.abc.Iterable[builtins.int] | None = ...,
         token_value: builtins.str = ...,
@@ -669,10 +747,10 @@ class Operation(google.protobuf.message.Message):
         tag_indices: collections.abc.Iterable[builtins.int] | None = ...,
         conditioned_on: collections.abc.Iterable[global___Arg] | None = ...,
     ) -> None: ...
-    def HasField(self, field_name: typing.Literal["couplerpulsegate", b"couplerpulsegate", "czpowgate", b"czpowgate", "fsimgate", b"fsimgate", "gate_value", b"gate_value", "hpowgate", b"hpowgate", "identitygate", b"identitygate", "internalgate", b"internalgate", "iswaplikegate", b"iswaplikegate", "iswappowgate", b"iswappowgate", "measurementgate", b"measurementgate", "phasedxpowgate", b"phasedxpowgate", "phasedxzgate", b"phasedxzgate", "resetgate", b"resetgate", "singlequbitcliffordgate", b"singlequbitcliffordgate", "token", b"token", "token_constant_index", b"token_constant_index", "token_value", b"token_value", "waitgate", b"waitgate", "xpowgate", b"xpowgate", "ypowgate", b"ypowgate", "zpowgate", b"zpowgate"]) -> builtins.bool: ...
-    def ClearField(self, field_name: typing.Literal["conditioned_on", b"conditioned_on", "couplerpulsegate", b"couplerpulsegate", "czpowgate", b"czpowgate", "fsimgate", b"fsimgate", "gate_value", b"gate_value", "hpowgate", b"hpowgate", "identitygate", b"identitygate", "internalgate", b"internalgate", "iswaplikegate", b"iswaplikegate", "iswappowgate", b"iswappowgate", "measurementgate", b"measurementgate", "phasedxpowgate", b"phasedxpowgate", "phasedxzgate", b"phasedxzgate", "qubit_constant_index", b"qubit_constant_index", "qubits", b"qubits", "resetgate", b"resetgate", "singlequbitcliffordgate", b"singlequbitcliffordgate", "tag_indices", b"tag_indices", "tags", b"tags", "token", b"token", "token_constant_index", b"token_constant_index", "token_value", b"token_value", "waitgate", b"waitgate", "xpowgate", b"xpowgate", "ypowgate", b"ypowgate", "zpowgate", b"zpowgate"]) -> None: ...
+    def HasField(self, field_name: typing.Literal["couplerpulsegate", b"couplerpulsegate", "czpowgate", b"czpowgate", "fsimgate", b"fsimgate", "gate_value", b"gate_value", "hpowgate", b"hpowgate", "identitygate", b"identitygate", "internalgate", b"internalgate", "iswaplikegate", b"iswaplikegate", "iswappowgate", b"iswappowgate", "measurementgate", b"measurementgate", "noisechannel", b"noisechannel", "phasedxpowgate", b"phasedxpowgate", "phasedxzgate", b"phasedxzgate", "resetgate", b"resetgate", "singlequbitcliffordgate", b"singlequbitcliffordgate", "token", b"token", "token_constant_index", b"token_constant_index", "token_value", b"token_value", "waitgate", b"waitgate", "xpowgate", b"xpowgate", "ypowgate", b"ypowgate", "zpowgate", b"zpowgate"]) -> builtins.bool: ...
+    def ClearField(self, field_name: typing.Literal["conditioned_on", b"conditioned_on", "couplerpulsegate", b"couplerpulsegate", "czpowgate", b"czpowgate", "fsimgate", b"fsimgate", "gate_value", b"gate_value", "hpowgate", b"hpowgate", "identitygate", b"identitygate", "internalgate", b"internalgate", "iswaplikegate", b"iswaplikegate", "iswappowgate", b"iswappowgate", "measurementgate", b"measurementgate", "noisechannel", b"noisechannel", "phasedxpowgate", b"phasedxpowgate", "phasedxzgate", b"phasedxzgate", "qubit_constant_index", b"qubit_constant_index", "qubits", b"qubits", "resetgate", b"resetgate", "singlequbitcliffordgate", b"singlequbitcliffordgate", "tag_indices", b"tag_indices", "tags", b"tags", "token", b"token", "token_constant_index", b"token_constant_index", "token_value", b"token_value", "waitgate", b"waitgate", "xpowgate", b"xpowgate", "ypowgate", b"ypowgate", "zpowgate", b"zpowgate"]) -> None: ...
     @typing.overload
-    def WhichOneof(self, oneof_group: typing.Literal["gate_value", b"gate_value"]) -> typing.Literal["xpowgate", "ypowgate", "zpowgate", "phasedxpowgate", "phasedxzgate", "czpowgate", "fsimgate", "iswappowgate", "measurementgate", "waitgate", "internalgate", "couplerpulsegate", "identitygate", "hpowgate", "singlequbitcliffordgate", "resetgate", "iswaplikegate"] | None: ...
+    def WhichOneof(self, oneof_group: typing.Literal["gate_value", b"gate_value"]) -> typing.Literal["xpowgate", "ypowgate", "zpowgate", "phasedxpowgate", "phasedxzgate", "czpowgate", "fsimgate", "iswappowgate", "measurementgate", "waitgate", "internalgate", "couplerpulsegate", "identitygate", "hpowgate", "singlequbitcliffordgate", "resetgate", "iswaplikegate", "noisechannel"] | None: ...
     @typing.overload
     def WhichOneof(self, oneof_group: typing.Literal["token", b"token"]) -> typing.Literal["token_value", "token_constant_index"] | None: ...
 
diff --git a/cirq-google/cirq_google/serialization/circuit_serializer.py b/cirq-google/cirq_google/serialization/circuit_serializer.py
index 61db4eb30a0..61764ef90fa 100644
--- a/cirq-google/cirq_google/serialization/circuit_serializer.py
+++ b/cirq-google/cirq_google/serialization/circuit_serializer.py
@@ -275,6 +275,20 @@ def _serialize_gate_op(
             arg_func_langs.float_arg_to_proto(
                 gate.q1_detune_mhz, out=msg.couplerpulsegate.q1_detune_mhz
             )
+        elif isinstance(gate, cirq.DepolarizingChannel):
+            arg_func_langs.float_arg_to_proto(
+                gate.p, out=msg.noisechannel.depolarizingchannel.probability
+            )
+        elif isinstance(gate, cirq.RandomGateChannel):
+            arg_func_langs.float_arg_to_proto(
+                gate.probability, out=msg.noisechannel.randomgatechannel.probability
+            )
+            self._serialize_gate_op(
+                gate.sub_gate(*op.qubits),
+                msg=msg.noisechannel.randomgatechannel.sub_gate,
+                constants=constants,
+                raw_constants=raw_constants,
+            )
         else:
             raise ValueError(f'Cannot serialize op {op!r} of type {type(gate)}')
 
@@ -730,6 +744,36 @@ def _deserialize_gate_op(
                 or 0.0,
             )
             op = gate(*qubits)
+        elif which_gate_type == 'noisechannel':
+            which_channel_type = operation_proto.noisechannel.WhichOneof('channel_value')
+            if which_channel_type == 'depolarizingchannel':
+                p = arg_func_langs.float_arg_from_proto(
+                    operation_proto.noisechannel.depolarizingchannel.probability
+                )
+                if not isinstance(p, float):
+                    raise ValueError(
+                        f"Depolarizing noise probability {p} " "cannot be symbol or None"
+                    )  # pragma: nocover
+                op = cirq.DepolarizingChannel(p=p)(*qubits)
+            elif which_channel_type == 'randomgatechannel':
+                p = arg_func_langs.float_arg_from_proto(
+                    operation_proto.noisechannel.randomgatechannel.probability
+                )
+                sub_gate = self._deserialize_gate_op(
+                    operation_proto.noisechannel.randomgatechannel.sub_gate,
+                    constants=constants,
+                    deserialized_constants=deserialized_constants,
+                )
+                if sub_gate is None or sub_gate.gate is None:
+                    raise ValueError(
+                        "Not a valid gate for RandomGateChannel: " f"{operation_proto}"
+                    )  # pragma: nocover
+                op = cirq.RandomGateChannel(probability=p, sub_gate=sub_gate.gate)(*qubits)
+            else:
+                raise ValueError(
+                    f'Unsupported serialized noise channel with type "{which_channel_type}".'
+                    f'\n\noperation_proto:\n{operation_proto}'
+                )  # pragma: nocover
         else:
             raise ValueError(
                 f'Unsupported serialized gate with type "{which_gate_type}".'
diff --git a/cirq-google/cirq_google/serialization/circuit_serializer_test.py b/cirq-google/cirq_google/serialization/circuit_serializer_test.py
index 86b092dac04..32b779eb3f6 100644
--- a/cirq-google/cirq_google/serialization/circuit_serializer_test.py
+++ b/cirq-google/cirq_google/serialization/circuit_serializer_test.py
@@ -386,6 +386,32 @@ def circuit_proto(json: dict, qubits: list[str]):
         ),
     ),
     (cirq.I(Q0), op_proto({'identitygate': {'qid_shape': [2]}, 'qubit_constant_index': [0]})),
+    (
+        cirq.depolarize(0.5)(Q0),
+        op_proto(
+            {
+                'noisechannel': {'depolarizingchannel': {'probability': {'float_value': 0.5}}},
+                'qubit_constant_index': [0],
+            }
+        ),
+    ),
+    (
+        cirq.X(Q0).with_probability(0.5),
+        op_proto(
+            {
+                'noisechannel': {
+                    'randomgatechannel': {
+                        'probability': {'float_value': 0.5},
+                        'sub_gate': {
+                            'xpowgate': {'exponent': {'float_value': 1.0}},
+                            'qubit_constant_index': [0],
+                        },
+                    }
+                },
+                'qubit_constant_index': [0],
+            }
+        ),
+    ),
 ]