Howard Lovecraft and the Kingdom of Madness is a 2018 Canadian animated film written, directed and produced by Sean Patrick O'Reilly and sequel to 2016 and 2017 films Howard Lovecraft and the Frozen Kingdom and Howard Lovecraft and the Undersea Kingdom. The trilogy is based on the work of American horror author H. P. Lovecraft.

Howard Lovecraft and the Frozen Kingdom is a 2016 animated film based on the graphic novel of the same name, itself inspired by the writings of American horror author H. P. Lovecraft. Two sequels, Howard Lovecraft and the Undersea Kingdom and Howard Lovecraft and the Kingdom of Madness, were released in 2017 and 2018.