1949 in international relations

blockade on Berlin imposed by the USSR from 1948 to 1949

province claimed but not controlled by the People's Republic of China

The RDS-1 (), also known as First Lightning (), was the first nuclear weapons test that was conducted by the Soviet Union. It was detonated on 29 August 1949 at 7:00 a.m. Kazakhstan Time (decree time) (UTC+06:00), at the Semipalatinsk Test Site in the Kazakh Soviet Socialist Republic, and yielded 22 kilotons of TNT.

1949 Dutch recognition of Indonesian independence

multilateral treaty, signed on 5 May 1949

official founding of the PRC

1949 Commonwealth Prime Ministers' Conference document

research expedition involving an international team of scientists (1949–1952)

first phase of the Cold War

Act of the UK Parliament merging Newfoundland into Canada

multilateral gathering conducted by the United Nations Conciliation Commission for Palestine

United States law, part of the Marshall Plan

Act of the Parliament of Australia, no longer in force, registered as C1949A00009