Pannychis (, ), from Greek words ('all, every') and ('night'), may refer to:
An all-night feast or ceremony of the ancient Eleusinian Mysteries Pannychis, a courtesan given by the Jewish king Herod the Great to the king of Cappodocia as thanks for reconciling a Herod family dispute Vigil, a period of purposeful sleeplessness, an occasion for devotional watching, or an observance Panichida (панихида), the name for Memorial service (Orthodox) in Slavic languages Pannychis (beetle), a longhorn beetle genus in the tribe Saperdini