Joseph Paul Ostrowski (November 15, 1916 – January 3, 2003) was a Major League Baseball pitcher.

After graduating from the University of Scranton in 1938, Ostrowski did not immediately enter professional baseball but opted instead to teach, which led to his nicknames of "Professor" and "Specs" as a player.

He was finally picked up at the age of 25 by the Boston Red Sox as an amateur free agent in 1941.

The 6 ft (1.83 m), 180 lb (82 kg) left-hander began his professional career that season with the Centreville Red Sox of the Class D Eastern Shore League.

After starting the season in the minors with the Toledo Mud Hens, Ostrowski made his major-league debut with the Browns on July 18, 1948.