Sári Fedák (26 October 1879, Beregszász (present-day Berehove, Ukraine) – 25 May 1955, Budapest, Hungary) was a Hungarian actress and singer, one of the most well-known prima donnas of her time. According to American journalist and non-fiction writer Richard Traubner, Fedák and Sári Petráss remain "the two best-remembered Hungarian female operetta stars of all time".
She studied acting with Szidi Rákosi until 1899, beginning her career the same year with the Magyar Színház theatre company. Beginning in 1900 she played in Pozsony (now Bratislava), and in several theatres in Budapest, including Népszínház, Király Színház, and Vígszínház. Following World War I, she spoke out against the Austro-Hungarian monarchy. Later, during the era of the Hungarian Soviet Republic she agitated for joining the Red Army.