OSU (7-3), the two-time defending Big 12 champions, finished conference play with a 3-3 record. The Cowgirls lead the league with three titles, taking the crown in 2009, 2012 and 2013.
All four Big 12 teams finished this season with a 3-3 record, but the Cowgirls claimed the head-to-head tiebreakers and point spread differential. Baylor will be the No. 2 seed, TCU is No. 3 and Kansas State will be seeded fourth.
The event, hosted by Baylor, is scheduled to take place in Waco, Texas, March 28-29 at Willis Family Equestrian Center.
OSU wraps up the regular season against Tennessee-Martin on March 15 at 10 a.m. at Animal Science Arena.
2014 Big 12 Equestrian Championship Seeds
1. Oklahoma State
2. Baylor
3. TCU
4. Kansas State