H. gigas may refer to: Harpactira gigas, a tarantula native to South Africa Hippotragus gigas, an extinct species of antelope Holmskioldia gigas, a flowering plant species found in Kenya and Tanzania Hyaenodon gigas, an extinct mammal species Hydrodamalis gigas, an extinct sirenian Hydrodynastes gigas, a rear-fanged venomous colubrid species found in South America Hysterocrates gigas, a tarantula native to Cameroon
See also Gigas (disambiguation)