1990 treaty dissolving the German Democratic Republic by joining the Federal Republic of Germany (Unification Treaty)

1990 FIBA World Championship — 1990 edition of the FIBA World Championship

1990–91 UEFA Cup — 20th season of Europe's secondary club football tournament organised by UEFA

1990–91 European Cup Winners' Cup — 1990–1991 edition of the European Cup Winners' Cup

Eurovision Song Contest 1990 — 35th edition of the Eurovision Song Contest

1990 Formula One World Championship — sports season

1990s — decade of the Gregorian calendar (1990–1999)

1990 FIFA World Cup — 14th FIFA World Cup, held in Italy

1990 Asian Games — 11th edition of the Asian Games

1990 African Cup of Nations — football tournament

1990 World Men's Handball Championship — 1990 edition of the World Men's Handball Championship