Open Society Foundations

Open Society Foundations (OSF), formerly the Open Society Institute, is a grantmaking network founded by business magnate George Soros. Open Society Foundations financially supports civil society groups around the world, with the stated aim of advancing justice, education, public health and independent media. The group's name was inspired by Karl Popper's 1945 book The Open Society and Its Enemies.

As of 2015, the OSF had branches in 37 countries, encompassing a group of country and regional foundations, such as the Open Society Initiative for West Africa, and the Open Society Initiative for Southern Africa; its headquarters are at 224 West 57th Street in New York City. In 2018, OSF announced it was closing its European office in Budapest and moving to Berlin, in response to legislation passed by the Hungarian government targeting the foundation's activities. As of 2021, OSF has reported expenditures in excess of $16 billion since its establishment in 1993, mostly in grants towards NGOs, aligned with the organization's mission.