Peter Michael Kozma (born April 11, 1988) is an American professional baseball shortstop who is a free agent.

He has previously played in Major League Baseball (MLB) for the St. Louis Cardinals, New York Yankees, Texas Rangers, Detroit Tigers, and Oakland Athletics.

A sure-handed defender with excellent range and throwing arm,[1][2][3] Kozma primarily plays shortstop.

[7] On May 18, 2011, Kozma was called up from the AAA Memphis Redbirds, with whom he hit .214 in 112 games, to the major league club to replace injured middle infielder Nick Punto.

He made his major league debut that night, and hit a double with an RBI in his first at-bat when pinch-hitting in the 5th inning at Busch Stadium.

Kozma was part of the Cardinals' postseason roster when the team won the 2011 World Series over the Texas Rangers.

Kozma became the Cardinals' primary shortstop in 2013 and finished with a .217 batting average, 20 doubles, a home run and three stolen bases in 143 games.

He provided a key defensive play in the sixth inning of Game 3 of the NLCS against the Los Angeles Dodgers.

Dodgers batter Juan Uribe hit a rapid ground ball in the hole, which Kozma backhanded and relayed to second baseman Matt Carpenter, tipping off an inning ending double play.

In Game 1 of the World Series against the Boston Red Sox, Kozma was involved in a controversial error/blown call that was overturned by the umpiring crew.

The following off-season, the Cardinals signed longtime American League player Jhonny Peralta as a free agent to upgrade their offense at shortstop, thus supplanting Kozma from his short-lived status as the starter.

[11] The Cardinals signed Mark Ellis, another free agent, and kept rookie second baseman Kolten Wong on the MLB roster for much of the season.

[12] The following spring training, Kozma resumed working out at all infield positions, and added time as a catcher.

Due to an injury to Didi Gregorius, the Yankees added Kozma to their Opening Day roster.

On January 9, 2018, the Detroit Tigers signed Kozma to a minor league contract with an invitation to spring training.

On November 9, 2018, Kozma re–signed with the Tigers organization on a minor league contract that included an invitation to spring training.

[33] He played in 113 games for the Triple-A Las Vegas Aviators in 2021, slashing .245/.307/.337 with 4 home runs, 40 RBI, and 6 stolen bases.

On March 2, 2023, Kozma signed with the Kane County Cougars of the American Association of Professional Baseball.