John William Oates (born April 7, 1949; New York City, New York) is an American rock guitarist, musician, songwriter, producer, and (for much of his career) moustache owner, best known as half of the rock and soul duo Hall & Oates (with founder/lead vocalist Daryl Hall).

Though he was a primary guitarist, he also co-wrote eight Billboard Number One songs such as: "Sara Smile" (with Daryl Hall) , "You Make My Dreams" (with Sara Allen & Daryl Hall), "She's Gone" (with Daryl Hall), "I Can't Go For That (No Can Do)" (with Sara Allen & Daryl Hall), "Maneater" (with Sara Allen & Daryl Hall), "Out…