The 2015 NCAA Division I men's basketball tournament involved 68 teams playing in a single-elimination tournament that determined the National Collegiate Athletic Association (NCAA) Division I men's basketball national champion for the 2014–15 season.

The 77th edition of the tournament began on March 17, 2015, and concluded with the championship game on April 6, at Lucas Oil Stadium in Indianapolis, Indiana.

In the West Region, #14 Georgia State of the Sun Belt Conference defeated #3 Baylor.

The Ivy League did not hold a tournament, but held a one-game playoff to break a tie in the regular season conference standings, with the winner receiving the automatic bid.

Duke was the overall 3 seed for the fourth time, previously advancing to the Final Four in two of those years: 2004 and 2010.

Regional all-tournament team: Pat Connaughton, Notre Dame; Zach Auguste, Notre Dame; Willie Cauley-Stein, Kentucky; Andrew Harrison, Kentucky[6] Regional most outstanding player: Karl-Anthony Towns, Kentucky[7] Regional all-tournament team: Frank Kaminsky, Wisconsin; Josh Gasser, Wisconsin;[8] T. J. McConnell, Arizona; Rondae Hollis-Jefferson, Arizona[9] Regional most outstanding player: Sam Dekker, Wisconsin[10] On February 20, 2018, the NCAA announced that the wins and records for Louisville's 2011–12, 2012–13, 2013–14, and 2014–15 seasons were vacated due to the sex scandal at Louisville.

The Wildcats, by beating Cincinnati in the third round, set an NCAA men's record with 36 straight wins to start a season.

Kansas would qualify again the next two seasons to set the record for consecutive NCAA Tournament appearances formerly held by North Carolina (1975–2001).

Michigan State reached its seventh Final Four in the last 18 seasons—the best mark in the nation during that time span.

The Wisconsin loss extended the Big Ten Conference's losing streak in national championship games to six.

As of 2015, Michigan State is the last Big Ten team to win a National Championship, having done so in 2000.

Per the NCAA, "Upsets are defined as when the winner of the game was seeded five or more places lower than the team it defeated."

According to Nielsen estimates, exclusive coverage of the opening full round of the NCAA Division I Men's Basketball Championship across TBS, CBS, TNT and truTV averaged a 6.6 overnight household rating/14 share — up 10% from last year and the highest since the tournament expanded to four telecast windows for the entire day.

Hunter, son of stool-bound coach Ron Hunter, that has already produced a moment sure to go down in history – the elder Hunter, who already tore his Achilles celebrating the team's Sun Belt conference tourney victory, fell off that stool in ecstasy after his son's three dropped to give the Panthers the 57-56 lead that would be the final margin,"[22] according to Andy Hutchins.

Both teams played each other earlier in the season, when UCLA beat the Blazers 88–76 in the Bahamas back in November.

Sources:[25][26] For the second consecutive year, the semifinals were exclusive to cable, with TBS airing the standard broadcast with Nantz, Raftery, Hill, and Wolfson.