Daniel Lee Jennings (born April 17, 1987) is an American former professional baseball pitcher.

He played in Major League Baseball (MLB) for the Miami Marlins, Chicago White Sox, Tampa Bay Rays, Milwaukee Brewers, and Washington Nationals.

Though born in Berkeley, California,[1] Jennings was raised in West Des Moines, Iowa.

[7] Returning to Jacksonville in 2010, Jennings was suspended for 50 games for violating minor league baseball's policy banning the use of performance-enhancing drugs.

[8] The Marlins promoted Jennings to MLB on April 30, 2012, and he pitched a scoreless inning in relief in his debut that day.

He returned to the Marlins shortly thereafter, passing concussion protocol and sustaining no permanent injury.

[9] On December 11, 2014, Jennings was traded to the Chicago White Sox in exchange for André Rienzo.

[10] On July 27, 2017, the White Sox traded Jennings to the Tampa Bay Rays in exchange for first baseman Casey Gillaspie.