The Aihai are a species of alien which appear in the H.P. Lovecraft-inspired Cthulhu Mythos.


Aihai are tall creatures, measuring over six feet in height. They possess a tough, leathery hide, a triple-nostrilled nose, sunken eyes, twin sets of sharp teeth, four-jounted fingers, and satyr-like legs. Some are birthed with a vestigial, atavistic third arm which sprouts from their angular chest. Unlike their ancestors, the Yorhi, the Aihai are not proficient in the use of advanced machinery, although occasionally one can be found operating ancient technology beyond the capabilities of human science, such as disintegrator rays.

The Aihai inhabit a collection of subterranean cities on Mars, modest in terms of size and architectural scope. They worship the powerful alien known as Vulthoom, although they see him as more of an equivalent to Satan than than to a Christian God. Despite this, the Aihai are a largely peaceful race, and are for the most part quietly friendly to the humans who encounter them.

One particular sect of Aihai worship the Great Old One known as The Dweller in the Gulf, although they appear to be a minority group, and conduct their practices in secret.