Lacrosse
- The 6th World Lacrosse Championship is held in Perth, Australia. The United States win, and Canada is the runner-up.
- The Philadelphia Wings beat the New England Blazers 17-7 in the Major Indoor Lacrosse League Championship.
- The Brooklin Redmen win the Mann Cup.
- Orangeville wins the Founders Cup.
- The St. Catharines Athletics win the Minto Cup.
Read more about this topic: 1990 In Sports