Giant mantis may refer to:
Insects Hierodula, a genus of praying mantids, which contains several species with common name giant Asian mantis Hierodula patellifera, also named giant Asian mantis, species of praying mantis within the genus Hierodula Deroplatys desiccata, or giant dead leaf mantis, a species of praying mantis of genus Deroplatys. Hierodula majuscula, also named giant rainforest mantis and the Australian giant mantis, species of praying mantis within the genus Hierodula Idolomantis diabolica, also named giant devil's flower mantis, the single species of praying mantis of genus Idolomantis. Paratoxodera cornicollis, or giant Malaysian stick mantis, a species of praying mantis of genus Paratoxodera. Tenodera aridifolia, also called Japanese giant mantis, a species of mantis in the subfamily Tenoderinae. Tenodera sinensis, also called the Chinese mantis, a species of mantis in the subfamily Tenoderinae that is nearly identical to T. aridifolia
In fiction Giant praying mantis, a monster in the 3rd edition of the Dungeons & Dragons role-playing game Gargantuan praying mantis, a monster in the 2nd edition of the Advanced Dungeons & Dragons role-playing game Giant praying mantis, a fictional creature in the novella A Shocker on Shock Street from the Goosebumps series Kamacuras, a kaiju film monster from Son of Godzilla and other films, called Gimantis in the U.S. version, a mutated giant mantis species