2017–18 UMBC Retrievers men's basketball team

The 2017–18 UMBC Retrievers men's basketball team represented the University of Maryland, Baltimore County during the 2017–18 NCAA Division I men's basketball season. The Retrievers, led by second-year head coach Ryan Odom as members of the America East Conference, started the season playing their home games at the Retriever Activities Center in Catonsville, Maryland, but moved to the new UMBC Event Center during the season. The new arena opened on February 3, 2018. UMBC beat UMass Lowell and Hartford to advance to the championship of the America East tournament where they defeated Vermont. As a result, the Retrievers received the conference's automatic bid to the NCAA tournament. As the No. 16 seed in the South region, they defeated the No. 1 overall seed Virginia by 20 points, becoming the first 16th-seeded team to beat a No. 1 seed. The win is considered one of the biggest upsets in NCAA Tournament history and sports history depending on seedings or point spreads. The Retrievers lost to Kansas State in the second round.