2003 Big 12 Conference baseball tournament

The 2003 Big 12 Conference baseball tournament was once again held at AT&T Bricktown Ballpark in Oklahoma City, OK (after a one-year hiatus) from May 21 through 25. Texas won their second consecutive tournament and earned the Big 12 Conference's automatic bid to the 2003 NCAA Division I baseball tournament. The tournament mirrored the format of the College World Series, with two 4-team double-elimination brackets and a final championship game.

Regular Season Standings
Source:
 * Colorado and Iowa State did not sponsor baseball teams.

Tournament

 * * indicates extra-inning game.
 * Kansas State and Texas Tech did not make the tournament.