diff --git a/aws_lambda_powertools/event_handler/api_gateway.py b/aws_lambda_powertools/event_handler/api_gateway.py
index be74ece69ea..17b8da641d3 100644
--- a/aws_lambda_powertools/event_handler/api_gateway.py
+++ b/aws_lambda_powertools/event_handler/api_gateway.py
@@ -85,6 +85,7 @@
     )
     from aws_lambda_powertools.event_handler.openapi.models import (
         Contact,
+        ExternalDocumentation,
         License,
         OpenAPI,
         SecurityScheme,
@@ -1714,6 +1715,7 @@ def get_openapi_schema(
         license_info: License | None = None,
         security_schemes: dict[str, SecurityScheme] | None = None,
         security: list[dict[str, list[str]]] | None = None,
+        external_documentation: ExternalDocumentation | None = None,
         openapi_extensions: dict[str, Any] | None = None,
     ) -> OpenAPI:
         """
@@ -1745,6 +1747,8 @@ def get_openapi_schema(
             A declaration of the security schemes available to be used in the specification.
         security: list[dict[str, list[str]]], optional
             A declaration of which security mechanisms are applied globally across the API.
+        external_documentation: ExternalDocumentation, optional
+            Additional external documentation for the API.
         openapi_extensions: Dict[str, Any], optional
             Additional OpenAPI extensions as a dictionary.
 
@@ -1775,6 +1779,7 @@ def get_openapi_schema(
         license_info = license_info or self.openapi_config.license_info
         security_schemes = security_schemes or self.openapi_config.security_schemes
         security = security or self.openapi_config.security
+        external_documentation = external_documentation or self.openapi_config.external_documentation
         openapi_extensions = openapi_extensions or self.openapi_config.openapi_extensions
 
         from pydantic.json_schema import GenerateJsonSchema
@@ -1814,6 +1819,9 @@ def get_openapi_schema(
             **openapi_extensions,
         }
 
+        if external_documentation:
+            output["externalDocs"] = external_documentation
+
         components: dict[str, dict[str, Any]] = {}
         paths: dict[str, dict[str, Any]] = {}
         operation_ids: set[str] = set()
@@ -1921,6 +1929,7 @@ def get_openapi_json_schema(
         license_info: License | None = None,
         security_schemes: dict[str, SecurityScheme] | None = None,
         security: list[dict[str, list[str]]] | None = None,
+        external_documentation: ExternalDocumentation | None = None,
         openapi_extensions: dict[str, Any] | None = None,
     ) -> str:
         """
@@ -1952,6 +1961,8 @@ def get_openapi_json_schema(
             A declaration of the security schemes available to be used in the specification.
         security: list[dict[str, list[str]]], optional
             A declaration of which security mechanisms are applied globally across the API.
+        external_documentation: ExternalDocumentation, optional
+            Additional external documentation for the API.
         openapi_extensions: Dict[str, Any], optional
             Additional OpenAPI extensions as a dictionary.
 
@@ -1977,6 +1988,7 @@ def get_openapi_json_schema(
                 license_info=license_info,
                 security_schemes=security_schemes,
                 security=security,
+                external_documentation=external_documentation,
                 openapi_extensions=openapi_extensions,
             ),
             by_alias=True,
@@ -1998,6 +2010,7 @@ def configure_openapi(
         license_info: License | None = None,
         security_schemes: dict[str, SecurityScheme] | None = None,
         security: list[dict[str, list[str]]] | None = None,
+        external_documentation: ExternalDocumentation | None = None,
         openapi_extensions: dict[str, Any] | None = None,
     ):
         """Configure OpenAPI specification settings for the API.
@@ -2031,6 +2044,8 @@ def configure_openapi(
             A declaration of the security schemes available to be used in the specification.
         security: list[dict[str, list[str]]], optional
             A declaration of which security mechanisms are applied globally across the API.
+        external_documentation: ExternalDocumentation, optional
+            A link to external documentation for the API.
         openapi_extensions: Dict[str, Any], optional
             Additional OpenAPI extensions as a dictionary.
 
@@ -2064,6 +2079,7 @@ def configure_openapi(
             license_info=license_info,
             security_schemes=security_schemes,
             security=security,
+            external_documentation=external_documentation,
             openapi_extensions=openapi_extensions,
         )
 
@@ -2088,6 +2104,7 @@ def enable_swagger(
         security: list[dict[str, list[str]]] | None = None,
         oauth2_config: OAuth2Config | None = None,
         persist_authorization: bool = False,
+        external_documentation: ExternalDocumentation | None = None,
         openapi_extensions: dict[str, Any] | None = None,
     ):
         """
@@ -2131,6 +2148,8 @@ def enable_swagger(
             The OAuth2 configuration for the Swagger UI.
         persist_authorization: bool, optional
             Whether to persist authorization data on browser close/refresh.
+        external_documentation: ExternalDocumentation, optional
+            A link to external documentation for the API.
         openapi_extensions: dict[str, Any], optional
             Additional OpenAPI extensions as a dictionary.
         """
@@ -2183,6 +2202,7 @@ def swagger_handler():
                 license_info=license_info,
                 security_schemes=security_schemes,
                 security=security,
+                external_documentation=external_documentation,
                 openapi_extensions=openapi_extensions,
             )
 
diff --git a/aws_lambda_powertools/event_handler/openapi/config.py b/aws_lambda_powertools/event_handler/openapi/config.py
index 597362d1ef9..83fe2156a57 100644
--- a/aws_lambda_powertools/event_handler/openapi/config.py
+++ b/aws_lambda_powertools/event_handler/openapi/config.py
@@ -12,6 +12,7 @@
 if TYPE_CHECKING:
     from aws_lambda_powertools.event_handler.openapi.models import (
         Contact,
+        ExternalDocumentation,
         License,
         SecurityScheme,
         Server,
@@ -51,6 +52,8 @@ class OpenAPIConfig:
         A declaration of the security schemes available to be used in the specification.
     security: list[dict[str, list[str]]], optional
         A declaration of which security mechanisms are applied globally across the API.
+    external_documentation: ExternalDocumentation, optional
+        A link to external documentation for the API.
     openapi_extensions: Dict[str, Any], optional
         Additional OpenAPI extensions as a dictionary.
 
@@ -77,4 +80,5 @@ class OpenAPIConfig:
     license_info: License | None = None
     security_schemes: dict[str, SecurityScheme] | None = None
     security: list[dict[str, list[str]]] | None = None
+    external_documentation: ExternalDocumentation | None = None
     openapi_extensions: dict[str, Any] | None = None
diff --git a/tests/functional/event_handler/_pydantic/test_openapi_external_documentation.py b/tests/functional/event_handler/_pydantic/test_openapi_external_documentation.py
new file mode 100644
index 00000000000..680e998b8bd
--- /dev/null
+++ b/tests/functional/event_handler/_pydantic/test_openapi_external_documentation.py
@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+from aws_lambda_powertools.event_handler.api_gateway import APIGatewayRestResolver
+from aws_lambda_powertools.event_handler.openapi.models import ExternalDocumentation
+
+
+def test_openapi_schema_no_external_documentation():
+    app = APIGatewayRestResolver()
+
+    schema = app.get_openapi_schema(title="Hello API", version="1.0.0")
+    assert not schema.externalDocs
+
+
+def test_openapi_schema_external_documentation():
+    app = APIGatewayRestResolver()
+
+    schema = app.get_openapi_schema(
+        title="Hello API",
+        version="1.0.0",
+        external_documentation=ExternalDocumentation(
+            description="Find out more about this API",
+            url="https://example.org/docs",
+        ),
+    )
+
+    assert schema.externalDocs
+    assert schema.externalDocs.description == "Find out more about this API"
+    assert str(schema.externalDocs.url) == "https://example.org/docs"