The 2018–19 George Washington Colonials men's basketball team represented George Washington University during the 2018–19 NCAA Division I men's basketball season. The Colonials were led by third-year head coach Maurice Joseph and played their home games at the Charles E. Smith Center in Washington, D.C. as members of the Atlantic 10 Conference. They finished the season9–24, 4–14 in A-10 play to finish in a tie for 12th place. As the No. 12 seed, they defeated Massachusetts in the first round of the A-10 tournament before losing to George Mason in the second round.