John Leon Pomorski (December 30, 1905 – December 6, 1977) was an American professional baseball pitcher in Major League Baseball. He played for the Chicago White Sox in 1934.
On September 7, 1947, he pitched a complete game 20-inning tie at the age of 41 years old while playing for the St-Maurice de Thetford Mines of the Eastern Townships Independent Intermediate League in a game against the Les Forestiers Catholiques de Drummondville in Canada.