April 3, 1978
1978 Asian Games — eighth edition of the Asian Games
1978 World Women's Handball Championship — 1978 edition of the World Women's Handball Championship
Eurovision Song Contest 1978 — 23rd edition of the Eurovision Song Contest
1978–79 UEFA Cup — 8th season of Europe's secondary club football tournament organised by UEFA
1978–79 European Cup — 24th season of the UEFA club football tournament
1978 Formula One season — sports season
1978 African Cup of Nations — football tournament
Nicaraguan Revolution — 20th century armed conflict in Nicaragua
South Lebanon conflict — 1978 war between Israel and Lebanon and the PLO
1978 World Men's Handball Championship — 1978 edition of the World Men's Handball Championship