珀西瓦里（Percival、又译作珀西瓦尔）是亚瑟王传说中圆桌骑士团的成员之一。与加拉哈德、鲍斯共组成圣杯三骑士。

珀西瓦里是珀西瓦里王的儿子。自小生长在远离卡美洛王朝的丛林里；直到后来，他游历来到了卡美洛王朝，便有幸成为了圆桌骑士之一，并加入了寻找圣杯的行列中。

相传此圣杯乃是基督在最后晚餐中用过的杯子；基督被钉在十字架上的时候，基督之血顺着钉在其体侧的架子上缓缓地流入到圣杯中。基督死后，约瑟同意将其尸体放进了自己的墓中，并将圣杯带到了不列颠，但后来圣杯却离奇失踪了，从此，圣杯便成为圆桌骑士苦苦寻觅的重要宝物。

Percival (/ˈpɜːrsᵻvəl/) (also spelled Perceval, Percivale, and other variants) is one of King Arthur's legendary Knights of the Round Table. First made famous by the French author Chretien de Troyes, in the tale Conte du Graal (also known simply as Perceval), his story was allotted to the fictional figure of Peredur son of Efwc in the Welsh adaptation of Chretien's tale called Peredur ab Efrawc. He is most well known for being the original hero in the quest for the Grail before being replaced in later literature by Galahad.