- Jan 24 Apple Computer Inc unveils its revolutionary Macintosh personal computer
- Feb 29 Pierre Trudeau announces he is stepping down after 15 years as Canadian Prime Minister
- Apr 23 AIDS-virus identified as HTLV-III (acquired immune deficiency syndrome)
- Jun 5 Indira Gandhi orders an attack on Sikh's holiest site, the Golden Temple
- Dec 3 Union Carbide pesticide plant leak of methyl isocyanate and other toxic compounds in Bhopal, India, kills 2,259 (official figure) - other estimates as high as 16,000 (including later deaths) and over half a million injured
- Dec 19 Chinese Premier Zhao Ziyang and British Prime Minister Margaret Thatcher sign the Sino-British Joint Declaration to transfer Hong Kong back to China in 1997
During a radio voice test, US President Reagan jokes he "signed legislation that would outlaw Russia forever. We begin bombing in 5 minutes."
On August 11, 1984