May 21, 1963
1963 Summer Universiade — multi-sport event in Porto Alegre, Brazil
1963 Cannes Film Festival — film festival edition
1963 Mediterranean Games — 4th edition of the Mediterranean Games
1963 FIBA World Championship — 1963 edition of the FIBA World Championship
1963 African Cup of Nations — football tournament
1963 Formula One season — sports season
1963 CONCACAF Championship — football tournament
1963 South American Championship — football tournament
EuroBasket 1963 — 1963 edition of the Eurobasket
1963 public backlash in Pahlavi-dynasty Iran