diff --git a/requests/types.py b/requests/types.py
new file mode 100644
index 00000000..994075ba
--- /dev/null
+++ b/requests/types.py
@@ -0,0 +1,48 @@
+from typing import (
+    Callable, Optional, Union, Any, Iterable, List, Mapping, MutableMapping,
+    Tuple, IO, Text
+)
+
+from . import auth
+from .models import Response, PreparedRequest
+from .cookies import RequestsCookieJar
+
+_ParamsMappingValueType = Union[str, bytes, int, float, Iterable[Union[str, bytes, int, float]]]
+Params = Optional[
+    Union[
+        Mapping[
+            Union[str, bytes, int, float], _ParamsMappingValueType],
+            Union[str, bytes],
+            Tuple[Union[str, bytes, int, float], _ParamsMappingValueType],
+            Mapping[str, _ParamsMappingValueType],
+            Mapping[bytes, _ParamsMappingValueType],
+            Mapping[int, _ParamsMappingValueType],
+            Mapping[float, _ParamsMappingValueType]
+    ]
+]
+Data = Union[
+    None,
+    bytes,
+    MutableMapping[str, str],
+    MutableMapping[str, Text],
+    MutableMapping[Text, str],
+    MutableMapping[Text, Text],
+    Iterable[Tuple[str, str]],
+    IO
+]
+_Hook = Callable[[Response], Any]
+
+Method = str
+URL = str
+Headers = Optional[Union[None, MutableMapping[Text, Text]]]
+Cookies = Optional[Union[None, RequestsCookieJar, MutableMapping[Text, Text]]]
+Files = Optional[MutableMapping[Text, IO]]
+Auth = Union[None, Tuple[Text, Text], auth.AuthBase, Callable[[PreparedRequest], PreparedRequest]]
+Timeout = Union[None, float, Tuple[float, float]]
+AllowRedirects = Optional[bool]
+Proxies = Optional[MutableMapping[Text, Text]]
+Hooks = Optional[MutableMapping[Text, Union[Iterable[_Hook], _Hook]]]
+Stream = Optional[bool]
+Verify = Union[None, bool, Text]
+Cert = Union[Text, Tuple[Text, Text]]
+JSON = Optional[MutableMapping]
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