The 2008–09 California Golden Bears men's basketball team represented the University of California, Berkeley in the 2008–09 NCAA Division I men's basketball season.

This was head coach Mike Montgomery's first season at California.

The Golden Bears played their home games at Haas Pavilion and participated in the Pacific-10 Conference.

They lost to USC in the quarterfinals of the Pac-10 tournament.

They received an at–large bid to the 2009 NCAA Division I men's basketball tournament, earning a 7 seed in the West Region.