Mr Goldblum and Mr Urban have joined previously announced cast members Cate Blanchett and Tessa Thompson, along with returning stars Chris Hemsworth and Tom Hiddleston, in the new instalment.
Mark Ruffalo, who plays the role of Hulk in the Marvel Cinematic Universe (MCU) movies, will also reprise his part in the upcoming film.
Ms Blanchett would play the villain Hela, Ms Thompson would play a new hero, Valkyrie, Mr Goldblum will play eccentric Grandmaster and Mr Urban will be seen as Skurge in the new movie.
Thor: Ragnarok, the third instalment in the Thor series after 2011 film Thor and 2013 film Thor: The Dark World.
The film will be directed by Taika Waititi.