Daniel Louis "Dan" Castellaneta (born October 29, 1957) is an American actor, voice actor, comedian and screenwriter. 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.

Dan Castellaneta provides the voice of Homer Simpson on Family Guy in "Ratings Guy". He also reprises his roles as Homer, Grampa Simpson, Barney Gumble, Krusty the Clown, Squeaky-Voiced Teen, Hans Moleman, Kodos, Mayor Quimby, and Blue-Haired Lawyer in "The Simpsons Guy".