About John Costello
Born 1960. John Costello is an American baseball player.
John Reilly Costello (born December 24, 1960) is an American former relief pitcher in Major League Baseball who played for the St. Louis Cardinals (-), Montreal Expos and San Diego Padres . He batted and threw right-handed.
Costello graduated from Oceanside High School in Oceanside, New York in 1979 and then played college baseball at Mercyhurst where he led all of NCAA with a 1.12 earned run average in 1982.
In a four-season career, Costello posted an 11–6 record with a 2.97 earned run average and four saves in 119 games pitched.
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Important facts
People in John Costello's life
Named in this biography and alive at the same time
Related people
Same field, nearest in time
Contemporaries
People whose lives overlapped John Costello's
Frequently asked questions
Who is John Costello?
American baseball player
When was John Costello born?
John Costello was born on 24 December 1960 in The Bronx.
What is John Costello's occupation?
John Costello is a baseball player.
What nationality is John Costello?
John Costello is American.
Sources & further reading
· DBpedia: John Costello (baseball)
Cite this page
APA: Biography.guide. (2026). John Costello. https://biography.guide/john-costello-baseball-player/
MLA: "John Costello." Biography.guide, https://biography.guide/john-costello-baseball-player/.
Chicago: "John Costello." Biography.guide. https://biography.guide/john-costello-baseball-player/.
Data last updated: 2026-09-20 · Spot an error? Report a correction.
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