阿耆尼（梵文：अग्नि，Agni），即火天，是吠陀教及印度教的火神，阿耆尼——अग्नि本身即是梵文「火焰」的名词，与拉丁语的火焰—－「ignis」是同源词（及与英文动词着火「ignite」同根）。阿耆尼作为火的神格化象征了火焰永恒不朽的奇迹，古印度人就相信供奉给阿耆尼（火）的祭品会被净化及传达到其他神祇，亦令阿耆尼带有净化和送信者的角色。阿耆尼是典型经历了三相神（梵天、毗湿奴及湿婆）信仰的兴起，但对自然界信仰（原提婆族）仍然保留了一定知名度的神祇。现今印度教还存在的火祭司—－「Agnihotri」，其职责是负责监察其崇拜者。

Agni (Sanskrit:अग्नि Agni), pronounced " ăgˈnē ", is the Rigvedic deity of fire and the conveyor of sacrifices to the Gods. He is also a god of divine knowledge, who leads man to the gods. He was one of the most important of the Vedic gods.