The Alpine Convention is an international territorial treaty for the sustainable development of the Alps. The objective of the treaty is to protect the natural environment of the Alps while promoting its development.

1991 FIFA World Youth Championship — International football competition

1991 European Super Cup — football match

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

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

1991 Formula One World Championship — sports season

EuroBasket 1991 — FIBA EuroBasket

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

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

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

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