Ella Georgiyevna Adayevskaya (Ella Adaïewsky; Russian: Элла (Елизавета) Георгиевна Адаевская; 22 February 1846 [O.S. 10 February] – 26 July 1926) was a Russian-German composer, pianist, and ethnomusicologist. Adayevskaya wrote vocal music (including choral works), chamber music, and two operas. She also edited a collection of Italian songs and published writings on folk music and the music of ancient Greece.