diff --git a/stdlib/os/__init__.pyi b/stdlib/os/__init__.pyi
index 24c6d7000..50d05b738 100644
--- a/stdlib/os/__init__.pyi
+++ b/stdlib/os/__init__.pyi
@@ -819,6 +819,8 @@ else:
     def WEXITSTATUS(status: int) -> int: ...
     def WSTOPSIG(status: int) -> int: ...
     def WTERMSIG(status: int) -> int: ...
+    if sys.version_info >= (3, 8):
+        from posix import posix_spawn as posix_spawn, posix_spawnp as posix_spawnp
 
 if sys.platform != "win32":
     from posix import sched_param
diff --git a/stdlib/posix.pyi b/stdlib/posix.pyi
index 249946364..5c5ab4cf4 100644
--- a/stdlib/posix.pyi
+++ b/stdlib/posix.pyi
@@ -1,6 +1,7 @@
 import sys
-from os import PathLike, stat_result as stat_result
-from typing import Dict, List, NamedTuple, Optional, overload
+from _typeshed import StrOrBytesPath
+from os import PathLike, _ExecEnv, _ExecVArgs, stat_result as stat_result
+from typing import Any, Dict, Iterable, List, NamedTuple, Optional, Sequence, Tuple, overload
 
 class uname_result(NamedTuple):
     sysname: str
@@ -166,6 +167,34 @@ def listdir(path: int) -> List[str]: ...
 @overload
 def listdir(path: PathLike[str]) -> List[str]: ...
 
+if sys.platform != "win32" and sys.version_info >= (3, 8):
+    def posix_spawn(
+        path: StrOrBytesPath,
+        argv: _ExecVArgs,
+        env: _ExecEnv,
+        *,
+        file_actions: Optional[Sequence[Tuple[Any, ...]]] = ...,
+        setpgroup: Optional[int] = ...,
+        resetids: bool = ...,
+        setsid: bool = ...,
+        setsigmask: Iterable[int] = ...,
+        setsigdef: Iterable[int] = ...,
+        scheduler: Optional[Tuple[Any, sched_param]] = ...,
+    ) -> int: ...
+    def posix_spawnp(
+        path: StrOrBytesPath,
+        argv: _ExecVArgs,
+        env: _ExecEnv,
+        *,
+        file_actions: Optional[Sequence[Tuple[Any, ...]]] = ...,
+        setpgroup: Optional[int] = ...,
+        resetids: bool = ...,
+        setsid: bool = ...,
+        setsigmask: Iterable[int] = ...,
+        setsigdef: Iterable[int] = ...,
+        scheduler: Optional[Tuple[Any, sched_param]] = ...,
+    ) -> int: ...
+
 if sys.platform == "win32":
     environ: Dict[str, str]
 else: