2003–04 Eastern Washington Eagles men's basketball team

The 2003–04 Eastern Washington Eagles men's basketball team represented Eastern Washington University during the 2003–04 NCAA Division I men's basketball season. The Eagles were led by fourth year head coach Ray Giacoletti and played their home games at Reese Court. They were members of the Big Sky Conference. They finished the season 17–13, 11–3 in Big Sky play to finish in a share for the regular season Big Sky championship. They defeated Weber State and Northern Arizona to be champions of the Big Sky tournament. They received an automatic bid to the NCAA tournament – the first appearance in school history – where they lost in the opening round to No. 2 seed and eventual Final Four participant Oklahoma State, 75–56.

Schedule and results
!colspan=9 style=| Regular season

!colspan=9 style=| Big Sky tournament

!colspan=9 style=| NCAA tournament