Wayne Horvitz (born 1955) is an American composer, keyboardist and producer. Horvitz has led the groups The President, Pigpen, Zony Mash, and the Four Plus One Ensemble. He has recorded or performed with John Zorn, Bill Frisell, Elliott Sharp, Danny Barnes, Tucker Martine, Butch Morris, Fred Frith, Julian Priester, Philip Wilson, Michael Shrieve, Carla Bley, Tim Young, Bobby Previte, Skerik, Douglas September and others. He is perhaps most famous for being the keyboardist of the band Naked City.