diff --git a/Lib/multiprocessing/pool.py b/Lib/multiprocessing/pool.py
--- a/Lib/multiprocessing/pool.py
+++ b/Lib/multiprocessing/pool.py
@@ -690,6 +690,9 @@
                     item = self._items.popleft()
                 except IndexError:
                     if self._index == self._length:
+                        for success, value in self._unsorted.values():
+                            if not success and isinstance(value, BaseException):
+                                raise value
                         raise StopIteration
                     raise TimeoutError