1991 Soviet Union referendum — referendum regarding the dissolution of the Soviet Union

1991 FIFA World Youth Championship — International football competition

1991–92 UEFA Cup — 21st season of Europe's secondary club football tournament organised by UEFA

1991 European Super Cup — football match

Eurovision Song Contest 1991 — 36th edition of the Eurovision Song Contest

1991 Formula One World Championship — sports season

1991 Copa América — 1991 edition of the Copa América association football competition

EuroBasket 1991 — FIBA EuroBasket

1991 CONCACAF Gold Cup — 1991 edition of the association football competition CONCACAF Gold Cup

1991 World Championships in Athletics — 1991 edition of the World Championships in Athletics

1991 IAAF World Indoor Championships — 1991 edition of the IAAF World Indoor Championships