Daniel Louis Castellaneta ( born October 29 , 1957 ) is an Emmy award winning American actor and comedian best known for providing the voice of Homer Simpson and other characters on the long-running FOX animated series The Simpsons . Daniel Louis `` Dan '' Castellaneta ( born October 29 , 1957 ) is an American film , theater and television actor , comedian , voice artist , singer and television writer . Noted for his long-running role as Homer Simpson on the animated television series The Simpsons , he voices many other characters on The Simpsons , including Abraham `` Grampa '' Simpson , Barney Gumble , Krusty the Clown , Groundskeeper Willie , Mayor Quimby and Hans Moleman .