Events in Sport
- May 5 127th Kentucky Derby: Jorge Chavez aboard Monarchos wins in 1:59.97
- May 9 Accra Sports Stadium Disaster: 129 Ghanian football fans die in a stampede caused by the firing of teargas by police following a decision by the referee in a crucial match between arch-rivals Accra Hearts of Oak and Kumasi Asante Kotoko
- May 19 126th Preakness: Gary Stevens aboard Point Given wins in 1:55.40
- May 21 NHL Western Conference Final: Colorado Avalanche beat St. Louis Blues, 4 games to 1
- May 22 NHL Eastern Conference Final: New Jersey Devils beat Pittsburgh Penguins, 4 games to 1
- May 23 9th UEFA Champions League Final: Bayern Munich beats Valencia (1-1, 5-4 on penalties) at Milan
- May 26 Fullback Andrew Walker kicks 5 penalties and 3 conversions as the ACT Brumbies win their first Super 12 Rugby title; beat Coastal Sharks (Durban), 36-6 at Bruce Stadium, Canberra
- May 27 Indianapolis 500: Hélio Castroneves wins in 3:31:54.180 (227.841 km/h)
- May 29 U.S. Supreme Court rules that disabled golfer Casey Martin can use a cart to ride in tournaments.