A list of the best giant monster movies of all time. We believe we thought of them all, but if your favorite giant monster film isn't on the list, please feel free to add it to the list of the best giant monster films list yourself. Giant monster movies have been with us for almost a century now, starting with the Lost World in 1925. While every genre is included on this list, giant monster movies tend to focus on horror, science fiction, and fantasy. Japan has a well known affinity for giant monsters, which they refer to as "Kaiju". Whatever your giant monster movie tastes may be, there is bound to be a film on this list of giant monster films that you will enjoy.