In which films does joker appear?

Well, the প্রশ্ন is not clear at first place, c'oz "JOKER" is a character, not a person in real. The actor though {Heath Ledger} has performed in lots of movies, like my personal পছন্দ "The Patriot".

The 1966 ব্যাটম্যান film, the 1989 ব্যাটম্যান film, The Dark Knight, Suicide Squad, and several animated films.