Mark Steven Kotsay (born December 2, 1975) is an American professional baseball manager and former outfielder.

In addition to being an outfielder, Kotsay was a closer in college; he pitched the final five outs to clinch his team's CWS title.

The Florida Marlins selected Kotsay in the first round, with the ninth overall pick, of the 1996 Major League Baseball draft.

He was moved to right field after Gary Sheffield was traded, a position better suited for the strong throwing arm which Kotsay regularly showed off.

Kotsay was traded in 2001, barely a week before Opening Day, to the San Diego Padres as part of a deal for Matt Clement and Eric Owens.

Moved back to center field, Kotsay improved his hitting, but he recorded only four outfield assists.

Over the next two seasons, however, Kotsay was defensively back on form, leading all National League center fielders in that category.

After his batting average slipped to .266 with a .726 OPS in 2003, Kotsay was traded to the Oakland Athletics for Terrence Long and Ramón Hernández.

Displaying his customary strong arm afield, he led American League center fielders with 11 assists.

News of the contract extension ended speculation that Kotsay would be traded to a team in need of a starting center fielder, such as the New York Yankees.

On Mother's Day, May 14, 2006, Kotsay was one of more than 50 hitters who brandished a pink bat to benefit the Breast Cancer Foundation.

The 2006 season marked Kotsay's first-ever appearance in a postseason game, as the Athletics clinched the 2006 AL West Division title.

[11] On August 27, 2008, Kotsay was traded to the Boston Red Sox for minor league outfielder Luis Sumoza.

[14] On July 24, 2009, Kotsay was designated for assignment by the Red Sox to free up a roster spot for newly acquired Adam LaRoche.

[15] On July 28, 2009, Kotsay was traded to Chicago White Sox for minor league outfielder Brian Anderson and cash considerations.

[25] In 2013, Kotsay made 23 starts in the field at the corner outfield spots and first base but appeared in 104 games, mostly as a pinch hitter.