圣杯（Holy Grail，或译「圣杯」）是在公元33年，犹太历尼散月十四日，也就是耶稣受难前的逾越节晚餐上，耶稣遣走加略人犹大后吩咐11个门徒喝下里面象征他的血的红葡萄酒，借此创立了受难纪念仪式。后来很多传说相信这个杯子具有某种神奇的能力，如果能找到这个圣杯而喝下其盛过的水就将返老还童、死而复生并且获得永生，这个传说广泛延续到很多文学、影视、游戏等作品中，比如亚瑟王传奇中，就有人说他终其一生的最大目标就是找到这个圣杯。华格纳的歌剧如《帕西法尔》、《罗恩格林》，也都是以圣杯骑士的故事为题材。相传彼世安温的魔法炉则是圣杯的前身。目前在欧洲大约有200个古酒杯，被认为可能是基督最后晚餐时所使用的圣杯。

The Holy Grail is a dish, plate, stone, or cup that is part of an important theme of Arthurian literature. According to legend, it has special powers, and is designed to provide happiness, eternal youth and food in infinite abundance.

A grail, wondrous but not explicitly holy, first appears in Perceval le Gallois, an unfinished romance by Chrétien de Troyes. It is a processional salver used to serve at a feast. Chrétien's story attracted many continuators, translators and interpreters in the later 12th and early 13th centuries, including Wolfram von Eschenbach, who perceived the grail as a great precious stone that fell from the sky. The Grail legend became interwoven with legends of the Holy Chalice. The connection with Joseph of Arimathea and with vessels associated with the Last Supper and crucifixion of Jesus dates from Robert de Boron's Joseph d'Arimathie (late 12th century) in which Joseph receives the Grail from an apparition of Jesus and sends it with his followers to Great Britain. Building upon this theme, later writers recounted how Joseph used the Grail to catch Christ's blood while interring him and how he founded a line of guardians to keep it safe in Britain. The legend may combine Christian lore with a Celtic myth of a cauldron endowed with special powers.