1999 Big 12 Conference baseball tournament

The 1999 Big 12 Conference baseball tournament was held at AT&T Bricktown Ballpark in Oklahoma City, OK from May 23 through 27. Nebraska won their first of three consecutive tournaments and earned the Big 12 Conference's automatic bid to the 1999 NCAA Division I baseball tournament. This was the first year the conference switched to format used by the College World Series with two 4-team double-elimination brackets and a final championship game.

Regular Season Standings
Source:
 * Colorado did not sponsor a baseball team.

Tournament

 * * indicates extra-inning game.
 * Iowa State, Kansas, and Kansas State did not make the tournament.