The 2017–18 Long Beach State 49ers men's basketball team represented California State University, Long Beach during the 2017–18 NCAA Division I men's basketball season.

The 49ers were led by 11th-year head coach Dan Monson and played their home games at the Walter Pyramid as members of the Big West Conference.

They lost in the quarterfinals of the Big West tournament to Cal State Fullerton.

[1] The 49ers finished the 2016–17 season 15–19, 9–7 in Big West play to finish in fourth place.

They defeated Hawaii in the quarterfinals of the Big West tournament before losing to UC Irvine in the semifinals.