The 2004–05 Pacific Tigers men's basketball team represented the University of the Pacific during the 2004–05 NCAA Division I men's basketball season.

The Tigers were led by 17th-year head coach Bob Thomason and played their home games at the Alex G. Spanos Center in Stockton, California as members of the Big West Conference.

Pacific swept through the Big West regular season schedule to finish a sparkling 18–0 in conference play.

[2] Playing in the Round of 32 for the second straight season, the Tigers were beaten by No.

1 seed Washington[3] to end their season at 27–4 (18–0 Big West).