January 1, 1991
1991 FIFA World Youth Championship — International football competition
1991 IAAF World Indoor Championships — 1991 edition of the IAAF World Indoor Championships
1991 European Super Cup — football match
1991 Formula One World Championship — sports season
1991 Copa América — 1991 edition of the Copa América association football competition
1991–92 UEFA Cup — 21st season of Europe's secondary club football tournament organised by UEFA
EuroBasket 1991 — FIBA EuroBasket
1991 World Championships in Athletics — 1991 edition of the World Championships in Athletics
1991 CONCACAF Gold Cup — 1991 edition of the association football competition CONCACAF Gold Cup
1991 World Aquatics Championships — 1991 edition of the World Aquatics Championships