The 1989 NCAA Men's Water Polo Championship was the 21st annual NCAA Men's Water Polo Championship to determine the national champion of NCAA men's collegiate water polo.

[1] UC Irvine defeated two-time defending champion California in the final, 9–8, to win their third national title.

Coached by Ted Newland, the Anteaters finished the season 27–6.

The Most Outstanding Player of the tournament was Dan Smoot (UC Irvine).

The tournament's leading scorer, with 11 goals, was Tom Warde from UC Irvine.