伊阿科斯（Ιακχος）是希腊神话中的一个神，同厄琉息斯秘仪有着密切的联系。他的名字在前往圣地的朝拜队伍中被调用，被认为举着火把带领着队伍。他可能只是一个狄俄倪索斯的称号（epithet），也有可能是一个独立的神祇，宙斯和得墨忒耳的儿子。他的身份和狄俄尼索斯经常是重叠的。

In Greek mythology, Iacchus (also Iacchos, Iakchos) (Greek:Ἴακχος) is an epithet of Dionysus, particularly associated with the Mysteries at Eleusis, where he was considered to be the son of Zeus and Demeter. Iacchus was the torch bearer of the procession from Eleusinion to Eleusis on the sixth day of the greater mysteries, sometimes regarded as the herald of the 'divine child' of the Goddess, born in the underworld, and sometimes as the child itself. Iacchus was called "the light-bringing star of our nocturnal rite", giving him possible associations with Sirius and Sothis.