1991 Midwestern Collegiate Conference men's basketball tournament

The 1991 Midwestern Collegiate Conference men's basketball tournament (now known as the Horizon League men's basketball tournament) was held March 7–9 at UD Arena in Dayton, Ohio.

1991 Midwestern Collegiate Conference men's basketball tournament
Classification	Division I
Season	1990–91
Teams	8
Site	UD Arena Dayton, Ohio
Champions	Xavier (6th title)
Winning coach	Pete Gillen (5th title)
MVP	Jamie Gladden (Xavier)
Midwestern Collegiate Conference men's basketball tournaments

1990–91 Midwestern Collegiate Conference men's basketball standings

	Conf							Overall
Team	W		L		PCT			W		L		PCT
Xavier †	11	–	3		.786			22	–	10		.688
Butler	10	–	4		.714			18	–	11		.621
Saint Louis	8	–	6		.571			19	–	14		.576
Dayton	8	–	6		.571			14	–	15		.483
Evansville	7	–	7		.500			14	–	14		.500
Marquette	7	–	7		.500			11	–	18		.379
Loyola (IL)	3	–	11		.214			10	–	19		.345
Detroit Mercy	2	–	12		.143			9	–	19		.321
† 1991 MCC tournament winner Rankings from AP Poll

Xavier defeated Saint Louis in the championship game, 81–65, to win their sixth MCC/Horizon League men's basketball tournament title.

The Musketeers received an automatic bid to the 1991 NCAA tournament as the #14 seed in the Midwest region.

Format

All eight conference members participated in the tournament and were seeded based on regular season conference records.

Bracket

	Quarterfinals Friday, March 7					Semifinals Saturday, March 8					Championship Sunday, March 9
	1	Xavier	66
	8	Detroit	59
						1	Xavier	90
						4	Dayton	71
	4	Dayton	71
	5	Evansville	59
											1	Xavier	81
											2	Saint Louis	65
	3	Saint Louis	92
	6	Marquette	82
						6	Loyola-Chicago	78
						2	Saint Louis	89
	7	Loyola-Chicago	75
	2	Butler	62