The 2015–16 George Washington Colonials men's basketball team represented George Washington University during the 2015–16 NCAA Division I men's basketball season.

The Colonials, led by fifth year head coach Mike Lonergan, played their home games at the Charles E. Smith Center and were members of the Atlantic 10 Conference.

As a #4 seed, they defeated Hofstra, Monmouth, and Florida to advance to the semifinals at Madison Square Garden.

At MSG, they defeated San Diego State and Valparaiso to become the 2016 NIT champions.

On September 17, 2016, following an investigation into allegations of verbal abuse of his players, head coach Mike Lonergan was fired.