Lloigor may refer to a fictional character in the Cthulhu Mythos:
Lloigor (Great Old One), the air elemental from "The Lair of the Star Spawn" (1932) by August Derleth and Mark Schorer Lloigor (Cthulhu Mythos race), invisible psychic beings from "the Return of the Lloigor" (1969) by Colin Wilson
See also Lloigoroth, a Marvel Comics character Lloegyr, the medieval Welsh name for a region of Britain Lloegr, the Welsh name for England