圣人，指被大众认为具有特别美德和神圣的人。在中国，古代圣明的君主帝王，及后世道德高尚儒学造诣高深者，称圣人。圣人的介定经常出现在诸子百家书籍。

有的宗教专门通过一定的仪式加封圣人，但也有圣人直接被大众尊奉为圣人。基督宗教（包括罗马天主教会、圣公宗、东正教会）、印度教、佛教（犹如****活佛和南传佛教的罗汉）、伊斯兰教、古巴的桑特里亚教中都有圣人。一些新纪元运动的人也将圣人的概念结合入他们的信仰。

如果没有被宗教封圣的被公众认可的人物，或者从当事人所不信仰的其他宗教的角度界定，可能会被称为伟人或英雄。

A saint, also historically known as a hallow, is a person who is recognized as having an exceptional degree of holiness, or likeness to God. In Christianity, the terms "saint" and "hallow" have a wide variety of meanings, depending on the context and denomination. The original Christian denotation was any believer who is "in Christ" and in whom Christ dwells, whether in Heaven or on earth. In Anglican, Catholic, Eastern Orthodox, Lutheran and Oriental Orthodox doctrine, all of their faithful deceased in Heaven are considered to be saints, but some are considered worthy of greater honour or emulation; official ecclesiastical recognition, and consequently veneration, is given to some saints through the process of canonization in the Catholic Church or glorification in the Eastern Orthodox Church.