diff --git a/fastapi/dependencies/utils.py b/fastapi/dependencies/utils.py
index a982b071a..a881312d7 100644
--- a/fastapi/dependencies/utils.py
+++ b/fastapi/dependencies/utils.py
@@ -37,6 +37,7 @@ from pydantic.errors import MissingError
 from pydantic.fields import (
     SHAPE_FROZENSET,
     SHAPE_LIST,
+    SHAPE_MAPPING,
     SHAPE_SEQUENCE,
     SHAPE_SET,
     SHAPE_SINGLETON,
@@ -74,6 +75,9 @@ sequence_shape_to_type = {
     SHAPE_TUPLE_ELLIPSIS: list,
 }
 
+mapping_shapes = {SHAPE_MAPPING}
+mapping_types = dict
+mapping_shapes_to_type = {SHAPE_MAPPING: dict}
 
 multipart_not_installed_error = (
     'Form data requires "python-multipart" to be installed. \n'
@@ -245,6 +249,20 @@ def is_scalar_sequence_field(field: ModelField) -> bool:
     return False
 
 
+def is_scalar_mapping_field(field: ModelField) -> bool:
+    if (field.shape in mapping_shapes) and not lenient_issubclass(
+        field.type_, BaseModel
+    ):
+        if field.sub_fields is not None:
+            for sub_field in field.sub_fields:
+                if not is_scalar_field(sub_field):
+                    return False
+        return True
+    if lenient_issubclass(field.type_, mapping_types):
+        return True
+    return False
+
+
 def get_typed_signature(call: Callable[..., Any]) -> inspect.Signature:
     signature = inspect.signature(call)
     globalns = getattr(call, "__globals__", {})
@@ -324,9 +342,10 @@ def get_dependant(
             add_param_to_fields(field=param_field, dependant=dependant)
         elif is_scalar_field(field=param_field):
             add_param_to_fields(field=param_field, dependant=dependant)
-        elif isinstance(
-            param.default, (params.Query, params.Header)
-        ) and is_scalar_sequence_field(param_field):
+        elif isinstance(param.default, (params.Query, params.Header)) and (
+            is_scalar_sequence_field(param_field)
+            or is_scalar_mapping_field(param_field)
+        ):
             add_param_to_fields(field=param_field, dependant=dependant)
         else:
             field_info = param_field.field_info
@@ -603,6 +622,10 @@ def request_params_to_args(
             received_params, (QueryParams, Headers)
         ):
             value = received_params.getlist(field.alias) or field.default
+        elif is_scalar_mapping_field(field) and isinstance(
+            received_params, (QueryParams,)
+        ):
+            value = received_params._dict
         else:
             value = received_params.get(field.alias)
         field_info = field.field_info
diff --git a/tests/main.py b/tests/main.py
index fce665704..3bc4150cc 100644
--- a/tests/main.py
+++ b/tests/main.py
@@ -189,6 +189,11 @@ def get_query_param_required_type(query: int = Query()):
     return f"foo bar {query}"
 
 
+@app.get("/query/params")
+def get_query_params(queries: Dict[str, int] = Query({})):
+    return f"foo bar {queries}"
+
+
 @app.get("/enum-status-code", status_code=http.HTTPStatus.CREATED)
 def get_enum_status_code():
     return "foo bar"
diff --git a/tests/test_application.py b/tests/test_application.py
index b7d72f9ad..c412515db 100644
--- a/tests/test_application.py
+++ b/tests/test_application.py
@@ -1078,6 +1078,41 @@ openapi_schema = {
                 ],
             }
         },
+        "/query/params": {
+            "get": {
+                "summary": "Get Query Params",
+                "operationId": "get_query_params_query_params_get",
+                "parameters": [
+                    {
+                        "required": False,
+                        "schema": {
+                            "title": "Queries",
+                            "type": "object",
+                            "additionalProperties": {"type": "integer"},
+                            "default": {},
+                        },
+                        "name": "queries",
+                        "in": "query",
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "Successful Response",
+                        "content": {"application/json": {"schema": {}}},
+                    },
+                    "422": {
+                        "description": "Validation Error",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/HTTPValidationError"
+                                }
+                            }
+                        },
+                    },
+                },
+            }
+        },
         "/enum-status-code": {
             "get": {
                 "responses": {
diff --git a/tests/test_invalid_sequence_param.py b/tests/test_invalid_sequence_param.py
index 475786adb..f03d18fb5 100644
--- a/tests/test_invalid_sequence_param.py
+++ b/tests/test_invalid_sequence_param.py
@@ -1,4 +1,4 @@
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Tuple
 
 import pytest
 from fastapi import FastAPI, Query
diff --git a/tests/test_query.py b/tests/test_query.py
index 0c73eb665..b44e188cd 100644
--- a/tests/test_query.py
+++ b/tests/test_query.py
@@ -54,6 +54,11 @@ response_not_valid_int = {
         ("/query/param-required/int?query=50", 200, "foo bar 50"),
         ("/query/param-required/int?query=foo", 422, response_not_valid_int),
         ("/query/frozenset/?query=1&query=1&query=2", 200, "1,2"),
+        (
+            "/query/params?first-query=1&second-query=2",
+            200,
+            "foo bar {'first-query': 1, " "'second-query': 2}",
+        ),
     ],
 )
 def test_get_path(path, expected_status, expected_response):