diff --git a/cirq-google/cirq_google/__init__.py b/cirq-google/cirq_google/__init__.py
index 0d2bc530477..86ddb2249fd 100644
--- a/cirq-google/cirq_google/__init__.py
+++ b/cirq-google/cirq_google/__init__.py
@@ -29,7 +29,6 @@
 from cirq_google.engine import (
     Calibration as Calibration,
     CalibrationLayer as CalibrationLayer,
-    CalibrationResult as CalibrationResult,
     Engine as Engine,
     EngineJob as EngineJob,
     EngineProgram as EngineProgram,
diff --git a/cirq-google/cirq_google/engine/__init__.py b/cirq-google/cirq_google/engine/__init__.py
index 30e8fb0aba8..743d02eb986 100644
--- a/cirq-google/cirq_google/engine/__init__.py
+++ b/cirq-google/cirq_google/engine/__init__.py
@@ -48,8 +48,6 @@
 
 from cirq_google.engine.calibration_layer import CalibrationLayer as CalibrationLayer
 
-from cirq_google.engine.calibration_result import CalibrationResult as CalibrationResult
-
 from cirq_google.engine.calibration_to_noise_properties import (
     noise_properties_from_calibration as noise_properties_from_calibration,
 )
diff --git a/cirq-google/cirq_google/engine/calibration_result.py b/cirq-google/cirq_google/engine/calibration_result.py
deleted file mode 100644
index 44353776d57..00000000000
--- a/cirq-google/cirq_google/engine/calibration_result.py
+++ /dev/null
@@ -1,77 +0,0 @@
-# Copyright 2020 The Cirq Developers
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-from __future__ import annotations
-
-import dataclasses
-import datetime
-from typing import Any, TYPE_CHECKING
-
-if TYPE_CHECKING:
-    import cirq_google
-
-
-@dataclasses.dataclass
-class CalibrationResult:
-    """Python implementation of the proto found in
-    cirq_google.api.v2.calibration_pb2.CalibrationLayerResult for use
-    in Engine calls.
-
-    Note that, if these fields are not filled out by the calibration API,
-    they will be set to the default values in the proto, as defined here:
-    https://developers.google.com/protocol-buffers/docs/proto3#default
-    These defaults will converted to `None` by the API client.
-
-    Deprecated: Calibrations are no longer supported via cirq.
-    """
-
-    code: Any
-    error_message: str | None
-    token: str | None
-    valid_until: datetime.datetime | None
-    metrics: cirq_google.Calibration
-
-    @classmethod
-    def _from_json_dict_(
-        cls,
-        code: Any,
-        error_message: str | None,
-        token: str | None,
-        utc_valid_until: float,
-        metrics: cirq_google.Calibration,
-        **kwargs,
-    ) -> CalibrationResult:
-        """Magic method for the JSON serialization protocol."""
-        valid_until = (
-            datetime.datetime.utcfromtimestamp(utc_valid_until)
-            if utc_valid_until is not None
-            else None
-        )
-        return cls(code, error_message, token, valid_until, metrics)
-
-    def _json_dict_(self) -> dict[str, Any]:
-        """Magic method for the JSON serialization protocol."""
-        utc_valid_until = (
-            self.valid_until.replace(tzinfo=datetime.timezone.utc).timestamp()
-            if self.valid_until is not None
-            else None
-        )
-        return {
-            'code': self.code,
-            'error_message': self.error_message,
-            'token': self.token,
-            'utc_valid_until': utc_valid_until,
-            'metrics': self.metrics,
-        }
diff --git a/cirq-google/cirq_google/engine/engine_job.py b/cirq-google/cirq_google/engine/engine_job.py
index e169ff994d2..b2b6ee6b579 100644
--- a/cirq-google/cirq_google/engine/engine_job.py
+++ b/cirq-google/cirq_google/engine/engine_job.py
@@ -31,7 +31,6 @@
     from google.protobuf import any_pb2
 
     import cirq_google.engine.engine as engine_base
-    from cirq_google.engine.calibration_result import CalibrationResult
     from cirq_google.engine.engine import engine_processor, engine_program
 
 TERMINAL_STATES = [
@@ -91,7 +90,6 @@ def __init__(
         self.context = context
         self._job = _job
         self._results: Sequence[EngineResult] | None = None
-        self._calibration_results: Sequence[CalibrationResult] | None = None
         self._batched_results: Sequence[Sequence[EngineResult]] | None = None
         self._job_result_future = job_result_future
 
diff --git a/cirq-google/cirq_google/json_test_data/spec.py b/cirq-google/cirq_google/json_test_data/spec.py
index 8021a72091a..47e24b36b6b 100644
--- a/cirq-google/cirq_google/json_test_data/spec.py
+++ b/cirq-google/cirq_google/json_test_data/spec.py
@@ -29,7 +29,6 @@
         'ProcessorSampler',
         'ValidatingSampler',
         'CouldNotPlaceError',
-        'CalibrationResult',
         # Abstract:
         'ExecutableSpec',
     ],