George Maciunas (English: ; Lithuanian: Jurgis Maciunas; November 8, 1931 – May 9, 1978) was a Lithuanian American artist, born in Kaunas.
He was a founding member and the central coordinator of Fluxus, an international community of artists, architects, composers, and designers.
Other leading members brought together by this movement included Ay-O, Joseph Beuys, Jonas Mekas, George Brecht, Dick Higgins, Yoko Ono, Nam June Paik and Wolf Vostell.
He is most famous for organising and performing early happenings and for assembling a series of highly influential artists' multiples.