厄琉息斯秘仪（希腊语：Ἐλευσίνια Μυστήρια）是古希腊时期位于厄琉息斯的一个秘密教派的年度入会仪式，这个教派崇拜得墨忒耳和珀耳塞福涅。厄琉息斯秘仪是公认的与早期农业民族有重大关联的一个上古原始宗教，它可以追溯到迈锡尼文明（公元前1600-1100年）。它起源于女神得墨忒耳失去女儿珀耳塞福涅后落寞的游荡，然后她在一个叫做厄琉息斯的小镇经历了一段故事，最后使得该小镇的人们都普遍崇拜她，她提拔了该镇的贵族成为祭祀，这个小镇最后为她创建庙宇并大兴祭祀。

厄琉息斯秘仪经历了希腊黑暗时代，之后又传到古罗马，它可能属于一个和女神崇拜、极乐世界相互对应的原始宗教体系。这个秘仪的崇拜内容和仪式过程处于严格的保密之中，全体信徒都参加的入会仪式则是一个信众与神直接沟通的重要渠道，以获得神力的佑护及来世的回报。有许多绘画和陶器的碎片，描绘了它的几个侧面，由于神秘的许诺和魔术般的来世信仰。

The Eleusinian Mysteries (Greek:Ἐλευσίνια Μυστήρια) were initiations held every year for the cult of Demeter and Persephone based at Eleusis in ancient Greece. They are the "most famous of the secret religious rites of ancient Greece". It is thought that their basis was an old agrarian cult which probably goes back to the Mycenean period (c. 1600 – 1100 BC) and it is believed that the cult of Demeter was established in 1500 BC. The mysteries represented the myth of the abduction of Persephone from her mother Demeter by the king of the underworld Hades, in a cycle with three phases, the "descent" (loss), the "search" and the "ascent", with the main theme the "ascent" of Persephone and the reunion with her mother. It was a major festival during the Hellenic era, and later spread to Rome. The name of the town, Eleusís, seems to be Pre-Greek and it is probably a counterpart with Elysium and the goddess Eileithyia.