The 1998 NCAA Men's Water Polo Championship was the 30th annual NCAA Men's Water Polo Championship to determine the national champion of NCAA men's collegiate water polo.

Tournament matches were played at the Marian Bergeson Aquatic Center in Newport Beach, California during December 1998.

[1] USC defeated Stanford in the final, 9–8 (in two overtimes), to win their first national title.

The Trojans (25–3) were coached by John Williams and Jovan Vavic.

The tournament's leading scorer, with 5 goals, was George Csaszar from USC.