2003 Big 12 football standings
	Conf				Overall
Team		W		L		W		L
North
#14 Kansas State x$		6	–	2		11	–	4
#19 Nebraska		5	–	3		10	–	3
Missouri		4	–	4		8	–	5
Kansas		3	–	5		6	–	7
Colorado		3	–	5		5	–	7
Iowa State		0	–	8		2	–	10
South
#3 Oklahoma x%		8	–	0		12	–	2
#12 Texas		7	–	1		10	–	3
Oklahoma State		5	–	3		9	–	4
Texas Tech		4	–	4		8	–	5
Texas A&M		2	–	6		4	–	8
Baylor		1	–	7		3	–	9
Championship: Kansas State 35, Oklahoma 7
$ – BCS representative as conference champion % – BCS at-large representative x – Division champion/co-champions Rankings from AP Poll

The 2003 Big 12 Football Championship Game was played on December 6, 2003 in Arrowhead Stadium in Kansas City, Missouri. The game determined the 2003 football champion of the Big 12 Conference. The Oklahoma Sooners, winners of the South division of the Big 12, were upset by the Kansas State Wildcats, who won the North division, by a score of 35–7. This was the second time the two teams met in the Big 12 Championship Game. The first was the 2000 Big 12 Championship Game, a game in which Oklahoma won 27-24.

The Sooners came into the game already being called possibly the greatest team in college football history. They were undefeated, boasting a 12–0 record, including 8–0 in conference play. They ranked first in points scored per game (48.3) and points allowed (13.1) per game. They also came in with dominant victories of 65–13 and 77–0 over Texas and Texas A&M, respectively.

The Wildcats came into the game 10–3, with a 6–2 mark in conference play. The Wildcats lost at home to Marshall in September, and followed it up with losses to #13 Texas in Austin, and Oklahoma State in Stillwater. The Wildcats would go on to win six games in a row, including their first win in Lincoln against the Nebraska Cornhuskers since 1968, clinching their third division title, and their third Big 12 Championship Game appearance.

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