John Pickens Curtiss (born April 5, 1993) is an American professional baseball pitcher in the Arizona Diamondbacks organization.

On February 3, 2020, Curtiss signed a minor league contract with the Tampa Bay Rays.

[8] He was called up on August 9, 2020, after Oliver Drake was placed on the injured list, and made his debut that day, pitching two perfect innings in a 4–3 victory over the New York Yankees.

[9] Curtiss earned his first major league win on August 11 in an 8–2 victory over the Boston Red Sox.

[10] Curtiss was the winning pitcher in Game 4 of the 2020 World Series, in which the Rays walked off the Los Angeles Dodgers 8–7 in a finish labelled as an "instant classic.

[14] On August 11, Curtiss was placed on the injured list after suffering a torn ulnar collateral ligament in his right elbow, ending his season.

[27] He cleared waivers and was sent outright to Albuquerque on May 30, however he rejected the assignment and subsequently elected free agency.

[29] The Rockies released him from the organization on July 1, however re-signed him to a new minor league contract two days later.

[30] On July 27, Curtiss' contract was purchased, and he was added back to the major league roster.