国际纯粹与应用物理学联合会（International Union of Pure and Applied Physics，简称IUPAP），是一个非政府性的国际性学术组织。该组织成立于1922年。国际纯粹与应用物理学联合会是国际科学联合会理事会（International Council of Scientific Unions，简称ICSU）下属的科学联合会之一。该组织受联合国教科文组织（UNESCO）的资助。

国际纯粹与应用物理学联合会权力机构为其代表大会，并设有执行委员会及各专业委员会。国际纯粹与应用物理学联合会每三年召开一次代表大会。

The International Union of Pure and Applied Physics (IUPAP) is an international non-governmental organization whose mission is to assist in the worldwide development of physics, to foster international cooperation in physics, and to help in the application of physics toward solving problems of concern to humanity. It was established in 1922 and the first General Assembly was held in 1923 in Paris.