András Szőllősy ([ˈandraːʃ ˈsøːlːøːʃi]; February 27, 1921 – December 6, 2007) was the creator of the Szőllősy index (Sz.), a frequently used index for the works of Hungarian composer Béla Bartók, was born at Szászváros (Orăştie) in Transylvania on February 27, 1921. He studied composition under Zoltán Kodály at the Franz Liszt Academy of Music where he was a professor of music history and theory from 1950 to his death. Szőllősy has a PhD from the University of Budapest. He won numerous prizes and awards for his own compositions, including "Distinguished Composition of the Year 1970" at UNESCO's International Rostrum of Composers in Paris for "Concerto No. 3 for sixteen strings", and the 1971 Erkel Prize. In 1985 Szőllősy won the Kossuth Prize, which is the highest official recognition of the Hungarian state, and in 1987 he was proclaimed Commandeur de l'Ordre des Arts et des lettres by the French government. Szöllősy's musicological writings include books on Bartók, Kodály, and Arthur Honegger.
The Szőllősy index includes all of Bartók's compositions as well as his musicological writings. For instance, Concerto for Orchestra has Szőllősy number 116 and Music for Strings, Percussion and Celesta has Sz. 106.
He died on December 6, 2007.