The 2003–04 Stanford Cardinal men's basketball team represented Stanford University in the 2003–04 NCAA Division I men's basketball season.

It was Head Coach Mike Montgomery's eighteenth and final season with the Cardinal.

[4] After going undefeated after 14 games, the Cardinal climbed to #2 in both polls (behind only Duke) by the ninth week of the season,[5] where they remained until the thirteenth week of the season when they reached #1 in both polls.

[6] The Cardinal remained there until dropping to #2 in the sixteenth week (behind undefeated St. Joseph's) after their undefeated streak of 26 games ended when they were upset by Washington.

[7] The Cardinal returned to the #1 ranking the following week (the final poll of the season) after St. Joseph's lost 87–67 to Xavier in the quarterfinals of the Atlantic 10 tournament.