2003–04 NCAA Division I men's ice hockey season

The 2003–04 NCAA Division I men's ice hockey season began on October 3, 2003 and concluded with the 2004 NCAA Division I men's ice hockey tournament's championship game on April 10, 2004 at the Fleet Center in Boston, Massachusetts. This was the 57th season in which an NCAA ice hockey championship was held and is the 110th year overall where an NCAA school fielded a team. The 2003-04 season was the inaugural year for the Atlantic Hockey Association after the discontinuation of Division I ice hockey sponsorship by the MAAC at the conclusion of the previous season.

Pre-season polls
The top teams in the nation as ranked before the start of the season.

The U.S. College Hockey Online poll was voted on by coaches, media, and NHL scouts. The USA Today/American Hockey Magazine poll was voted on by coaches and media.

Final regular season polls
The top 15 teams ranked before the NCAA tournament.

2004 NCAA tournament
Note: * denotes overtime period(s)

Scoring leaders
The following players led the league in points at the conclusion of the season.

GP = Games played; G = Goals; A = Assists; Pts = Points; PIM = Penalty minutes

Leading goaltenders
The following goaltenders led the league in goals against average at the end of the regular season while playing at least 33% of their team's total minutes.

GP = Games played; Min = Minutes played; W = Wins; L = Losses; OT = Overtime/shootout losses; GA = Goals against; SO = Shutouts; SV% = Save percentage; GAA = Goals against average

2004 NHL Entry Draft
† incoming freshman