The 2012–13 Big 12 men's basketball season began with practices in October 2012, followed by the start of the regular-season in November. Conference play began in early January 2013 and concluded in March with the 2013 Big 12 Men's Basketball Tournament at the Sprint Center in Kansas City. This was the first season in the Big 12 for two former Mountain West and Big East teams, as the TCU Horned Frogs and the West Virginia Mountaineers, respectively, played their first seasons in the conference.
() first place votes
Pre-Season All-Big 12 Teams
Player of the Year: Pierre Jackson, BaylorNewcomer of the Year: Amath M'Baye, OklahomaFreshman of the Year: Marcus Smart, Oklahoma StateThis table summarizes the head-to-head results between teams in conference play. (x) indicates games remaining this season.
March 13–16, 2013– Big 12 Conference Basketball Tournament, Sprint Center, Kansas City, MO.Several players from the conference declared early for the NBA draft. Several players were among the 60 players invited to the 2013 NBA Draft Combine. The following conference players were drafted:
Ben McLemore, Sacramento Kings, 1st round, 7th overallJeff Withey, Portland Trailblazers, 2nd round, 39th overallPierre Jackson, Philadelphia 76ers, 2nd round, 42nd overallRomero Osby, Orlando Magic, 2nd round, 51st overallAll-Big 12 Awards and Teams
Player of the Year: Marcus Smart, Oklahoma StateDefensive Player of the Year: Jeff Withey, KansasNewcomer of the Year: Will Clyburn, Iowa StateFreshman of the Year: Marcus Smart, Oklahoma StateSixth Man Award: Tyrus McGee, Iowa StateScholar-Athlete of the Year: Melvin Ejim, Iowa StateCoach of the Year: Bruce Weber, Kansas State
All-Big 12 First Team
Ben McLemore, Kansas, GJeff Withey, Kansas, CRodney McGruder, Kansas State, GRomero Osby, Oklahoma, FMarcus Smart, Oklahoma State, G
All-Big 12 Second Team
Pierre Jackson, Baylor, GWill Clyburn, Iowa State, GTravis Releford, Kansas, GÁngel Rodríguez, Kansas State, GMarkel Brown, Oklahoma State, G
All-Big 12 Third Team
Isaiah Austin, Baylor, CMelvin Ejim, Iowa State, FAmath M'Baye, Oklahoma, FSteven Pledger, Oklahoma, GLe'Bryan Nash, Oklahoma State, G/F
All-Big 12 Honorable Mention
Cory Jefferson (Baylor)Korie Lucious (Iowa State)Tyrus McGee (Iowa State)Elijah Johnson (Kansas)Shane Southwell (Kansas State)Michael Cobbins (Oklahoma State)Jaye Crockett (Texas Tech)Eron Harris (West Virginia)Deniz Kilicli (West Virginia)
Big 12 All-Defensive Team
Chris Babb, Iowa State, GTravis Releford, Kansas, GJeff Withey, Kansas, CAngel Rodriguez, Kansas State, GMichael Cobbins, Oklahoma State, FMarcus Smart, Oklahoma State, G
Big 12 All-Rookie Team
Isaiah Austin, Baylor, CWill Clyburn, Iowa State, GGeorges Niang, Iowa State, FBen McLemore, Kansas, GAmath M'Baye, Oklahoma, FMarcus Smart, Oklahoma State, G