The 2003 NCAA Division III Men's Ice Hockey Tournament was the culmination of the 2002–03 season, the 20th such tournament in NCAA history.
It concluded with Norwich defeating Oswego State in the championship game 2–1.
All First Round and Quarterfinal matchups were held at home team venues, while all succeeding games were played in Northfield, Vermont, where Norwich University coincidentally hosted the Frozen Four the year they won.
Automatic bids were offered to the conference tournament champion of seven different conferences with one at-large bid for the best remaining team from each region.
The quarterfinal brackets were arranged so that were all higher-seeded teams to advance, the first overall seed would play the fourth overall seed in the semifinals.