diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e438ce0b6..7c959bec2e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Fixed
+
+### Added
+- `opentelemetry-instrumentation`: botocore: Add support for AWS Secrets Manager semantic convention attribute
+  ([#3765](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3765))
+
 ## Version 1.37.0/0.58b0 (2025-09-11)
 
 ### Fixed
diff --git a/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/__init__.py b/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/__init__.py
index 599be4236c..dd8ba24e9f 100644
--- a/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/__init__.py
+++ b/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/__init__.py
@@ -35,6 +35,9 @@ def loader():
     "bedrock-runtime": _lazy_load(".bedrock", "_BedrockRuntimeExtension"),
     "dynamodb": _lazy_load(".dynamodb", "_DynamoDbExtension"),
     "lambda": _lazy_load(".lmbd", "_LambdaExtension"),
+    "secretsmanager": _lazy_load(
+        ".secretsmanager", "_SecretsManagerExtension"
+    ),
     "stepfunctions": _lazy_load(".sfns", "_StepFunctionsExtension"),
     "sns": _lazy_load(".sns", "_SnsExtension"),
     "sqs": _lazy_load(".sqs", "_SqsExtension"),
diff --git a/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/secretsmanager.py b/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/secretsmanager.py
new file mode 100644
index 0000000000..f1b1d8ba21
--- /dev/null
+++ b/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/secretsmanager.py
@@ -0,0 +1,45 @@
+# Copyright The OpenTelemetry Authors
+#
+# 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
+#
+#     http://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 opentelemetry.instrumentation.botocore.extensions.types import (
+    _AttributeMapT,
+    _AwsSdkExtension,
+    _BotocoreInstrumentorContext,
+    _BotoResultT,
+)
+from opentelemetry.semconv._incubating.attributes.aws_attributes import (
+    AWS_SECRETSMANAGER_SECRET_ARN,
+)
+from opentelemetry.trace.span import Span
+
+
+class _SecretsManagerExtension(_AwsSdkExtension):
+    def extract_attributes(self, attributes: _AttributeMapT):
+        """
+        SecretId is extracted if a secret ARN, the function extracts the attribute
+        only if the SecretId parameter is provided as an arn which starts with
+        `arn:aws:secretsmanager:`
+        """
+        secret_id = self._call_context.params.get("SecretId")
+        if secret_id and secret_id.startswith("arn:aws:secretsmanager:"):
+            attributes[AWS_SECRETSMANAGER_SECRET_ARN] = secret_id
+
+    def on_success(
+        self,
+        span: Span,
+        result: _BotoResultT,
+        instrumentor_context: _BotocoreInstrumentorContext,
+    ):
+        secret_arn = result.get("ARN")
+        if secret_arn:
+            span.set_attribute(AWS_SECRETSMANAGER_SECRET_ARN, secret_arn)
diff --git a/instrumentation/opentelemetry-instrumentation-botocore/tests/test_botocore_secretsmanager.py b/instrumentation/opentelemetry-instrumentation-botocore/tests/test_botocore_secretsmanager.py
new file mode 100644
index 0000000000..d2fe8deb91
--- /dev/null
+++ b/instrumentation/opentelemetry-instrumentation-botocore/tests/test_botocore_secretsmanager.py
@@ -0,0 +1,86 @@
+# Copyright The OpenTelemetry Authors
+#
+# 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
+#
+#     http://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.
+
+import botocore.session
+from moto import mock_aws
+
+from opentelemetry.instrumentation.botocore import BotocoreInstrumentor
+from opentelemetry.semconv._incubating.attributes.aws_attributes import (
+    AWS_SECRETSMANAGER_SECRET_ARN,
+)
+from opentelemetry.test.test_base import TestBase
+
+
+class TestSecretsManagerExtension(TestBase):
+    def setUp(self):
+        super().setUp()
+        BotocoreInstrumentor().instrument()
+        session = botocore.session.get_session()
+        session.set_credentials(
+            access_key="access-key", secret_key="secret-key"
+        )
+        self.region = "us-west-2"
+        self.client = session.create_client(
+            "secretsmanager", region_name=self.region
+        )
+
+    def tearDown(self):
+        super().tearDown()
+        BotocoreInstrumentor().uninstrument()
+
+    def create_secret_and_get_arn(self, name: str = "test-secret") -> str:
+        """
+        Create a secret in mocked Secrets Manager and return its ARN.
+        """
+        # Clear spans before creating secret for helper method
+        self.memory_exporter.clear()
+        response = self.client.create_secret(
+            Name=name, SecretString="test-secret-value"
+        )
+        return response["ARN"]
+
+    @mock_aws
+    def test_tag_resource_with_arn(self):
+        secret_arn = self.create_secret_and_get_arn()
+
+        self.client.tag_resource(
+            SecretId=secret_arn, Tags=[{"Key": "Environment", "Value": "Test"}]
+        )
+
+        spans = self.memory_exporter.get_finished_spans()
+        assert spans
+        self.assertEqual(len(spans), 2)
+        span = spans[1]  # tag_resource span
+        self.assertEqual(
+            span.attributes[AWS_SECRETSMANAGER_SECRET_ARN],
+            secret_arn,
+        )
+
+    @mock_aws
+    def test_create_secret(self):
+        secret_name = "test-secret"
+        response = self.client.create_secret(
+            Name=secret_name, SecretString="test-secret-value"
+        )
+        secret_arn = response["ARN"]
+
+        spans = self.memory_exporter.get_finished_spans()
+        assert spans
+        self.assertEqual(len(spans), 1)
+        span = spans[0]  # create_secret span
+        # Should capture ARN from response
+        self.assertEqual(
+            span.attributes[AWS_SECRETSMANAGER_SECRET_ARN],
+            secret_arn,
+        )