diff --git a/sdk/identity/azure-identity/CHANGELOG.md b/sdk/identity/azure-identity/CHANGELOG.md
index a164938150c9..5c0f944d3b57 100644
--- a/sdk/identity/azure-identity/CHANGELOG.md
+++ b/sdk/identity/azure-identity/CHANGELOG.md
@@ -18,6 +18,7 @@
 ### Other Changes
 
 - Bumped minimum dependency on `msal` to `>=1.31.0`.
+- Replace instances of `azure.core.pipeline.transport.HttpRequest` with `azure.core.rest.HttpRequest`. ([#44993](https://github.com/Azure/azure-sdk-for-python/pull/44993))
 
 ## 1.26.0b1 (2025-11-07)
 
diff --git a/sdk/identity/azure-identity/azure/identity/_credentials/app_service.py b/sdk/identity/azure-identity/azure/identity/_credentials/app_service.py
index ff4531cb8525..4f8bca54380f 100644
--- a/sdk/identity/azure-identity/azure/identity/_credentials/app_service.py
+++ b/sdk/identity/azure-identity/azure/identity/_credentials/app_service.py
@@ -5,7 +5,7 @@
 import functools
 import os
 from typing import Optional, Dict, Any
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 
 from .._constants import EnvironmentVariables
 from .._internal.msal_managed_identity_client import MsalManagedIdentityClient
@@ -34,6 +34,4 @@ def _get_client_args(**kwargs: Any) -> Optional[Dict]:
 
 
 def _get_request(url: str, scope: str, identity_config: Dict) -> HttpRequest:
-    request = HttpRequest("GET", url)
-    request.format_parameters(dict({"api-version": "2019-08-01", "resource": scope}, **identity_config))
-    return request
+    return HttpRequest("GET", url, params=dict({"api-version": "2019-08-01", "resource": scope}, **identity_config))
diff --git a/sdk/identity/azure-identity/azure/identity/_credentials/azure_arc.py b/sdk/identity/azure-identity/azure/identity/_credentials/azure_arc.py
index 765af7bc7cfe..b43edaecb7f9 100644
--- a/sdk/identity/azure-identity/azure/identity/_credentials/azure_arc.py
+++ b/sdk/identity/azure-identity/azure/identity/_credentials/azure_arc.py
@@ -7,7 +7,7 @@
 from typing import Dict
 
 from azure.core.exceptions import ClientAuthenticationError
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 from azure.core.pipeline.policies import HTTPPolicy
 from azure.core.pipeline import PipelineRequest, PipelineResponse
 
@@ -27,9 +27,7 @@ def _get_request(url: str, scope: str, identity_config: Dict) -> HttpRequest:
             "DefaultAzureCredential ensure the AZURE_CLIENT_ID environment variable is not set."
         )
 
-    request = HttpRequest("GET", url)
-    request.format_parameters(dict({"api-version": "2020-06-01", "resource": scope}, **identity_config))
-    return request
+    return HttpRequest("GET", url, params=dict({"api-version": "2020-06-01", "resource": scope}, **identity_config))
 
 
 def _get_secret_key(response: PipelineResponse) -> str:
diff --git a/sdk/identity/azure-identity/azure/identity/_credentials/azure_ml.py b/sdk/identity/azure-identity/azure/identity/_credentials/azure_ml.py
index bed313195c2c..3572ca624cbc 100644
--- a/sdk/identity/azure-identity/azure/identity/_credentials/azure_ml.py
+++ b/sdk/identity/azure-identity/azure/identity/_credentials/azure_ml.py
@@ -6,7 +6,7 @@
 import os
 from typing import Optional, Dict
 
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 
 from .._constants import EnvironmentVariables
 from .._internal.msal_managed_identity_client import MsalManagedIdentityClient
@@ -39,9 +39,7 @@ def _get_client_args(**kwargs) -> Optional[Dict]:
 
 
 def _get_request(url: str, scope: str, identity_config: Dict) -> HttpRequest:
-    request = HttpRequest("GET", url)
-    request.format_parameters(dict({"api-version": "2017-09-01", "resource": scope}, **identity_config))
-    return request
+    return HttpRequest("GET", url, params=dict({"api-version": "2017-09-01", "resource": scope}, **identity_config))
 
 
 def _parse_expires_on(content: Dict) -> None:
diff --git a/sdk/identity/azure-identity/azure/identity/_credentials/cloud_shell.py b/sdk/identity/azure-identity/azure/identity/_credentials/cloud_shell.py
index 61aefdb0c28b..41d8fb82f929 100644
--- a/sdk/identity/azure-identity/azure/identity/_credentials/cloud_shell.py
+++ b/sdk/identity/azure-identity/azure/identity/_credentials/cloud_shell.py
@@ -6,7 +6,7 @@
 import os
 from typing import Any, Optional, Dict, Mapping
 
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 
 from .._constants import EnvironmentVariables
 from .._internal import within_dac
@@ -43,5 +43,4 @@ def get_unavailable_message(self, desc: str = "") -> str:
 
 
 def _get_request(url: str, scope: str, identity_config: Dict) -> HttpRequest:
-    request = HttpRequest("POST", url, data=dict({"resource": scope}, **identity_config))
-    return request
+    return HttpRequest("POST", url, data=dict({"resource": scope}, **identity_config))
diff --git a/sdk/identity/azure-identity/azure/identity/_credentials/imds.py b/sdk/identity/azure-identity/azure/identity/_credentials/imds.py
index b1e82bb88052..ece23fbc4419 100644
--- a/sdk/identity/azure-identity/azure/identity/_credentials/imds.py
+++ b/sdk/identity/azure-identity/azure/identity/_credentials/imds.py
@@ -8,7 +8,7 @@
 
 from azure.core.pipeline import PipelineResponse
 from azure.core.exceptions import ClientAuthenticationError, HttpResponseError
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 from azure.core.credentials import AccessTokenInfo
 from azure.core.pipeline.policies import RetryPolicy
 
@@ -60,9 +60,7 @@ def _get_request(scope: str, identity_config: Dict) -> HttpRequest:
         os.environ.get(EnvironmentVariables.AZURE_POD_IDENTITY_AUTHORITY_HOST, IMDS_AUTHORITY).strip("/")
         + IMDS_TOKEN_PATH
     )
-    request = HttpRequest("GET", url)
-    request.format_parameters(dict({"api-version": "2018-02-01", "resource": scope}, **identity_config))
-    return request
+    return HttpRequest("GET", url, params=dict({"api-version": "2018-02-01", "resource": scope}, **identity_config))
 
 
 def _check_forbidden_response(ex: HttpResponseError) -> None:
diff --git a/sdk/identity/azure-identity/azure/identity/_credentials/service_fabric.py b/sdk/identity/azure-identity/azure/identity/_credentials/service_fabric.py
index c3fe591cc5d2..b79234ee4adf 100644
--- a/sdk/identity/azure-identity/azure/identity/_credentials/service_fabric.py
+++ b/sdk/identity/azure-identity/azure/identity/_credentials/service_fabric.py
@@ -8,7 +8,7 @@
 
 from azure.core.credentials import AccessToken, AccessTokenInfo, TokenRequestOptions
 from azure.core.exceptions import ClientAuthenticationError
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 
 from .._constants import EnvironmentVariables
 from .._internal.msal_managed_identity_client import MsalManagedIdentityClient
@@ -55,6 +55,6 @@ def _get_client_args(**kwargs: Any) -> Optional[Dict]:
 
 
 def _get_request(url: str, scope: str, identity_config: Dict) -> HttpRequest:
-    request = HttpRequest("GET", url)
-    request.format_parameters(dict({"api-version": "2019-07-01-preview", "resource": scope}, **identity_config))
-    return request
+    return HttpRequest(
+        "GET", url, params=dict({"api-version": "2019-07-01-preview", "resource": scope}, **identity_config)
+    )
diff --git a/sdk/identity/azure-identity/azure/identity/_internal/aad_client.py b/sdk/identity/azure-identity/azure/identity/_internal/aad_client.py
index 216f601f3869..d4d9ff0ae536 100644
--- a/sdk/identity/azure-identity/azure/identity/_internal/aad_client.py
+++ b/sdk/identity/azure-identity/azure/identity/_internal/aad_client.py
@@ -7,7 +7,7 @@
 
 from azure.core.credentials import AccessTokenInfo
 from azure.core.pipeline import Pipeline
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 from .aad_client_base import AadClientBase
 from .aadclient_certificate import AadClientCertificate
 from .pipeline import build_pipeline
diff --git a/sdk/identity/azure-identity/azure/identity/_internal/aad_client_base.py b/sdk/identity/azure-identity/azure/identity/_internal/aad_client_base.py
index b66cb15ab1b1..e359cc50af8a 100644
--- a/sdk/identity/azure-identity/azure/identity/_internal/aad_client_base.py
+++ b/sdk/identity/azure-identity/azure/identity/_internal/aad_client_base.py
@@ -13,7 +13,7 @@
 
 from azure.core.pipeline import PipelineResponse
 from azure.core.pipeline.policies import ContentDecodePolicy
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 from azure.core.credentials import AccessTokenInfo
 from azure.core.exceptions import ClientAuthenticationError
 from .utils import get_default_authority, normalize_authority, resolve_tenant
diff --git a/sdk/identity/azure-identity/azure/identity/_internal/managed_identity_client.py b/sdk/identity/azure-identity/azure/identity/_internal/managed_identity_client.py
index 44b318e6bb19..d305ffe33abc 100644
--- a/sdk/identity/azure-identity/azure/identity/_internal/managed_identity_client.py
+++ b/sdk/identity/azure-identity/azure/identity/_internal/managed_identity_client.py
@@ -12,7 +12,7 @@
 from azure.core.exceptions import ClientAuthenticationError, DecodeError
 from azure.core.pipeline.policies import ContentDecodePolicy
 from azure.core.pipeline import PipelineResponse
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 from .. import CredentialUnavailableError
 from .._internal import _scopes_to_resource
 from .._internal.pipeline import build_pipeline
diff --git a/sdk/identity/azure-identity/azure/identity/_internal/msal_client.py b/sdk/identity/azure-identity/azure/identity/_internal/msal_client.py
index 0fc6cdbef569..b09bcbb6fc9e 100644
--- a/sdk/identity/azure-identity/azure/identity/_internal/msal_client.py
+++ b/sdk/identity/azure-identity/azure/identity/_internal/msal_client.py
@@ -7,10 +7,7 @@
 
 from azure.core.exceptions import ClientAuthenticationError
 from azure.core.pipeline.policies import ContentDecodePolicy
-from azure.core.pipeline.transport import (  # pylint:disable=no-legacy-azure-core-http-response-import
-    HttpRequest,
-    HttpResponse,
-)
+from azure.core.rest import HttpRequest, HttpResponse
 from azure.core.pipeline import PipelineResponse
 from .pipeline import build_pipeline
 
@@ -22,7 +19,7 @@ class MsalResponse:
     """Wraps HttpResponse according to msal.oauth2cli.http.
 
     :param response: The response to wrap.
-    :type response: ~azure.core.pipeline.transport.HttpResponse
+    :type response: ~azure.core.rest.HttpResponse
     """
 
     def __init__(self, response: PipelineResponse) -> None:
@@ -84,19 +81,20 @@ def post(
         **kwargs: Any
     ) -> MsalResponse:
         # pylint:disable=unused-argument
-        request = HttpRequest("POST", url, headers=headers)
-        if params:
-            request.format_parameters(params)
+        request_headers = dict(headers) if headers else {}
+        content: Optional[bytes] = None
+        request_data: Optional[Dict[str, str]] = None
+
         if data:
             if isinstance(data, dict):
-                request.headers["Content-Type"] = "application/x-www-form-urlencoded"
-                request.set_formdata_body(data)
+                request_headers["Content-Type"] = "application/x-www-form-urlencoded"
+                request_data = data
             elif isinstance(data, str):
-                body_bytes = data.encode("utf-8")
-                request.set_bytes_body(body_bytes)
+                content = data.encode("utf-8")
             else:
                 raise ValueError('expected "data" to be text or a dict')
 
+        request = HttpRequest("POST", url, headers=request_headers, params=params, data=request_data, content=content)
         response = self._pipeline.run(request, stream=False, retry_on_methods=_POST)
         self._store_auth_error(response)
         return MsalResponse(response)
@@ -105,9 +103,7 @@ def get(
         self, url: str, params: Optional[Dict[str, str]] = None, headers: Optional[Dict[str, str]] = None, **kwargs: Any
     ) -> MsalResponse:
         # pylint:disable=unused-argument
-        request = HttpRequest("GET", url, headers=headers)
-        if params:
-            request.format_parameters(params)
+        request = HttpRequest("GET", url, headers=headers, params=params)
         response = self._pipeline.run(request, stream=False)
         self._store_auth_error(response)
         return MsalResponse(response)
@@ -118,7 +114,7 @@ def get_error_response(self, msal_result: Dict) -> Optional[HttpResponse]:
         :param msal_result: The result of an MSAL request.
         :type msal_result: dict
         :return: The HTTP response associated with the error, if any.
-        :rtype: ~azure.core.pipeline.transport.HttpResponse or None
+        :rtype: ~azure.core.rest.HttpResponse or None
         """
         error_code, response = getattr(self._local, "error", (None, None))
         if response and error_code == msal_result.get("error"):
diff --git a/sdk/identity/azure-identity/azure/identity/aio/_internal/aad_client.py b/sdk/identity/azure-identity/azure/identity/aio/_internal/aad_client.py
index 7b99f85ac912..bfe2625f24da 100644
--- a/sdk/identity/azure-identity/azure/identity/aio/_internal/aad_client.py
+++ b/sdk/identity/azure-identity/azure/identity/aio/_internal/aad_client.py
@@ -8,7 +8,7 @@
 from azure.core.credentials import AccessTokenInfo
 from azure.core.pipeline import AsyncPipeline
 from azure.core.pipeline.policies import AsyncHTTPPolicy, SansIOHTTPPolicy
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 from ..._internal import AadClientCertificate
 from ..._internal import AadClientBase
 from ..._internal.pipeline import build_async_pipeline
diff --git a/sdk/identity/azure-identity/tests/perfstress_tests/bearer_token_auth_policy.py b/sdk/identity/azure-identity/tests/perfstress_tests/bearer_token_auth_policy.py
index bb59a93c212c..48fdb57a13b6 100644
--- a/sdk/identity/azure-identity/tests/perfstress_tests/bearer_token_auth_policy.py
+++ b/sdk/identity/azure-identity/tests/perfstress_tests/bearer_token_auth_policy.py
@@ -12,7 +12,7 @@
 from azure.core.credentials import AccessToken
 from azure.core.pipeline import AsyncPipeline, Pipeline
 from azure.core.pipeline.policies import AsyncBearerTokenCredentialPolicy, BearerTokenCredentialPolicy
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 
 
 class BearerTokenPolicyTest(PerfStressTest):
diff --git a/sdk/identity/azure-identity/tests/test_imds_credential.py b/sdk/identity/azure-identity/tests/test_imds_credential.py
index a1d5ff3fa76f..ea0c057a4602 100644
--- a/sdk/identity/azure-identity/tests/test_imds_credential.py
+++ b/sdk/identity/azure-identity/tests/test_imds_credential.py
@@ -16,7 +16,8 @@
 )
 from azure.core.pipeline import PipelineResponse
 from azure.core.pipeline.policies import RetryPolicy
-from azure.core.pipeline.transport import HttpRequest, HttpResponse
+from azure.core.rest import HttpRequest
+from azure.core.pipeline.transport import HttpResponse
 import pytest
 
 from helpers import mock, mock_response, Request, validating_transport, GET_TOKEN_METHODS
diff --git a/sdk/identity/azure-identity/tests/test_imds_credential_async.py b/sdk/identity/azure-identity/tests/test_imds_credential_async.py
index 051f360fa660..79dbc47aad86 100644
--- a/sdk/identity/azure-identity/tests/test_imds_credential_async.py
+++ b/sdk/identity/azure-identity/tests/test_imds_credential_async.py
@@ -17,7 +17,8 @@
 from azure.identity._credentials.imds import PIPELINE_SETTINGS
 from azure.core.pipeline import PipelineResponse
 from azure.core.pipeline.policies import AsyncRetryPolicy
-from azure.core.pipeline.transport import HttpRequest, HttpResponse
+from azure.core.rest import HttpRequest
+from azure.core.pipeline.transport import HttpResponse
 import pytest
 
 from helpers import mock_response, Request, GET_TOKEN_METHODS
diff --git a/sdk/identity/azure-identity/tests/test_managed_identity_client.py b/sdk/identity/azure-identity/tests/test_managed_identity_client.py
index 0e9636ae047f..a96c7472f4c3 100644
--- a/sdk/identity/azure-identity/tests/test_managed_identity_client.py
+++ b/sdk/identity/azure-identity/tests/test_managed_identity_client.py
@@ -6,7 +6,7 @@
 import time
 
 from azure.core.exceptions import ClientAuthenticationError, ServiceRequestError
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 from azure.identity._internal.managed_identity_client import ManagedIdentityClient
 import pytest
 
diff --git a/sdk/identity/azure-identity/tests/test_managed_identity_client_async.py b/sdk/identity/azure-identity/tests/test_managed_identity_client_async.py
index 03a9d870aa4a..96ddfd70814b 100644
--- a/sdk/identity/azure-identity/tests/test_managed_identity_client_async.py
+++ b/sdk/identity/azure-identity/tests/test_managed_identity_client_async.py
@@ -7,7 +7,7 @@
 from unittest.mock import Mock, patch
 
 from azure.core.exceptions import ClientAuthenticationError, ServiceRequestError
-from azure.core.pipeline.transport import HttpRequest
+from azure.core.rest import HttpRequest
 from azure.identity.aio._internal.managed_identity_client import AsyncManagedIdentityClient
 import pytest