The 1998-99 UMass Minutemen men's basketball team represented the University of Massachusetts. The Head Coach was James "Bruiser" Flint. The team played its home games primarily in the Mullins Center in Amherst, Massachusetts, and was a member of the Atlantic 10 Conference.

The season represented the 90th season of basketball in the school's history.

• Final Record: 14-16
• Conference Record: 9-7 (Third place, East Division)
• A-10 Tournament: 1-1 (Lost in Quarter-Finals)
• Postseason: None

Older content is still available here: https://umasshoops.com/games/1990s.htm#8-9%20Scoreboard