John Patrick Reinheimer (born July 19, 1992) is an American professional baseball shortstop who is a free agent.

He has previously played in Major League Baseball (MLB) for the Arizona Diamondbacks and New York Mets.

In 2014, he played for the Clinton LumberKings and High Desert Mavericks,[4] posting a combined .276 batting average with three home runs, 58 RBIs, and 39 stolen bases in 130 total games between both teams.

On June 3, 2015, the Mariners traded Reinheimer along with Dominic Leone, Welington Castillo and Gabby Guerrero to the Arizona Diamondbacks for Mark Trumbo and Vidal Nuño.

Reinheimer spent 2016 with the Reno Aces where he compiled a .288 batting average with two home runs and 48 RBIs in 132 games.

[8] Reinheimer recorded his first Major League hit on August 15 against Cody Carroll of the Baltimore Orioles at Camden Yards.

On February 1, 2021, Reinheimer signed a minor league deal with an invitation to Spring Training with his original team, the Seattle Mariners.

On June 16, 2023, Reinheimer had his contract purchased by the Kansas City Royals and was assigned to the Double–A Northwest Arkansas Naturals.

[23] On August 29, 2023, Reinheimer signed with the Gastonia Honey Hunters of the Atlantic League of Professional Baseball.