Jason Alan Bartlett (born October 30, 1979, in Mountain View, California) is a Major League Baseball shortstop for the Tampa Bay Rays. He grew up in Lodi, California and attended St. Mary's (Stockton) High School. Bartlett went to the University of Oklahoma. His MLB debut was August 3, 2004, for the Minnesota Twins.

Bartlett recorded his first five-hit game in the Twins' 11-5 victory over the Kansas City Royals on August 6, 2006. When on the Twins, Bartlett was one of four players known for speed and small ball, nicknamed "The Piranhas" by Chicago White Sox manager, Ozzie Guillén. The Twins embraced the term during the 2006 season. The other Piranhas were Jason Tyner, Luis Castillo, and Nick Punto.

In 2007 he led all major league shortstops in errors, with 26. On November 28, 2007, the Twins traded Bartlett along with Matt Garza and Eduardo Morlan to the Tampa Bay Rays for Delmon Young, Jason Pridie, and Brendan Harris.