The Cold War from 1947 to 1948 is the period within the Cold War from the Truman Doctrine in 1947 to the incapacitation of the Allied Control Council in 1948. The Cold War emerged in Europe a few years after the successful US–USSR–UK coalition won World War II in Europe, and extended to 1989–1991. It took place worldwide, but it had a partially different timing outside Europe. Some conflicts between the West and the USSR appeared earlier. In 1945–1946 the US and UK strongly protested Soviet political takeover efforts in Eastern Europe and Iran, while the hunt for Soviet spies made the tensions more visible. However, historians emphasize the decisive break between the US–UK and the USSR came in 1947–1948 over such issues as the Truman Doctrine, the Marshall Plan and the breakdown of cooperation in governing occupied Germany by the Allied Control Council. In 1947, Bernard Baruch, the multimillionaire financier and adviser to presidents from Woodrow Wilson to Harry S. Truman, coined the term "Cold War" to describe the increasingly chilly relations between three World War II Allies: the United States and British Empire together with the Soviet Union.

The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc, that started in 1947, two years after the end of World War II and lasted to 1991, the fall of the Soviet Union.