April 17 - Pol Pot proclaims the "Democratic Republic of Kampuchea" in Cambodia and becomes its Prime Minister (1975-1979).
April 25 - Vietnam War: As North Vietnamese forces close in on the South Vietnamese capital Saigon, the Australian Embassy is closed and evacuated, almost ten years to the day since the first Australian troop commitment to South Vietnam.
July 17 - Apollo-Soyuz Test Project: An American Apollo and a Soviet Soyuz spacecraft dock with each other in orbit marking the first such link-up between spacecraft from the two nations.
August 11 - Mário Lemos Pires, Governor of Portuguese Timor, abandons the capital Dili following UTD coup and outbreak of civil war between UDT and Fretilin.
November 3 - An independent audit of Mattel, of the United States largest toy manufacturers, reveals that company officials fabricated press releases and financial information to "maintain the appearance of continued corporate growth."
Simon and Garfunkel release single "My Little Town," the last single they have released together to date. Song hits #9 on Billboard charts and is released on both their solo albums of 1975.