John Costa Rizzo (July 30, 1912 – December 4, 1977) was an American outfielder in Major League Baseball from 1938 to 1942.

Rizzo set the Pittsburgh Pirates record for most home runs in a season, with 23 in his rookie year of 1938.

[3] No other rookie would break a team single-season home run record until Pete Alonso of the New York Mets did so in 2019.

[4] Rizzo held the Pirate rookie record with Kiner until Jason Bay hit 26 in his first season in 2004.

In turn, the Reds traded Rizzo to the Philadelphia Phillies on June 15, 1940, in exchange for outfielder Morrie Arnovich.

[12] He received three points in voting for the NL's Most Valuable Player that season, enough to tie him for 29th place in the balloting.