Open Society Institute – Sofia is a local non-governmental organization (NGO) based in Bulgaria that supports efforts to strengthen civil society within the country in areas including civic participation, public policy, and upholding human rights. The organization was founded in 1990 through support from philanthropist George Soros. ¹

1. “About Us.” Open Society Institute-Sofia, Accessed April 27, 2023. https://osis.bg/?p=666&lang=en