The 2017–18 Cal State Fullerton Titans men's basketball team represented California State University, Fullerton during the 2017–18 NCAA Division I men's basketball season.

The Titans, led by fifth-year head coach Dedrique Taylor, played their home games at the Titan Gym, in Fullerton, California, as members of the Big West Conference.

They defeated Long Beach State and UC Davis to advance to the championship game of the Big West tournament.

15 seed in the East region, they lost to Purdue in the first round.

In the Big West tournament, they defeated Cal State Northridge in the quarterfinals, before losing to UC Davis in the semifinals.