John Francis Tumpane (born May 4, 1983) is an American Major League Baseball umpire, who wears number 74.

[3] Tumpane is known for his emphatic and demonstrative strikeout signal in which he hammers his right fist in the direction of the right-hand batter's box in a similar fashion to stabbing, which has earned him the nickname "The Ripper".

[5] On May 4, 2018, he was the home plate umpire for Walker Buehler, Tony Cingrani, Yimi Garcia, and Adam Liberatore's of the Los Angeles Dodgers combined no-hitter against the San Diego Padres.

[6] On August 25, 2020, Tumpane was the second base umpire for a no-hitter thrown by Lucas Giolito of the Chicago White Sox against the Pittsburgh Pirates.

[7] In game 2 of the 2020 American League Championship Series, on October 12, 2020, Tumpane correctly called 134 of 135 pitches at which a batter did not swing.