25 April – North Melbourne and Sydney kick between them 32.18 (210) in the first half. It is the record aggregate score for a half of VFL/AFL football.
2 June – Carlton kick their first goal with 33 second to go against Footscray, the closest a team has come to finishing goalless since Richmond kicked 0.8 (8) in 1961 against St. Kilda.
8 September – Hawthorn beat West Coast 18.16 (124) to 15.11 (101) in the first final outside Melbourne.
1991 AFL Grand Final (28 September) – Hawthorn wins the 95th AFL premiership beating West Coast 20.19 (139) to 13.8 (86) in the only Grand Final at VFL Park.
Wigan retained their title in the English Rugby League competition, with Oldham, Sheffield Eagles and Rochdale Hornets being relegated. To date this is Rochdale's last appearance in the top flight.
13 December – Steve Crocker sets the first official world record in the men's 50m freestyle (short course) in Sheffield, United Kingdom, clocking 25.64.