The 2015–16 Fort Wayne Mastodons men's basketball team represented Indiana University – Purdue University Fort Wayne during the 2015–16 NCAA Division I men's basketball season.

The Mastodons, led by second year head coach Jon Coffman, played their home games at the Gates Sports Center, with five home games at the Allen County War Memorial Coliseum, and were members of The Summit League.

They lost in the semifinals of the Summit League tournament to North Dakota State.

As a regular season league champion who was also the #1 seed in their league tournament, they received an automatic bid to the National Invitation Tournament where they lost in the first round to San Diego State.

They lost to South Dakota State in the quarterfinals of the Summit League tournament.