三神论（英语：Tritheism），又称三元论，一种宗教信条，认为宇宙中存在三个力量相等的神灵。它不同于一神论，也与二元论不同。

著名的三神论代表为印度教，他们认为湿婆、毗湿奴与梵天是三个至高神。

在基督教中，三神论被认为是异端的一种，又称三位异体说。它否定三位一体，认为圣父、圣子、圣灵是三个分离的神灵个体，并不是一体的。

Tritheism is the belief that cosmic divinity is composed of three powerful entities. As generally conceived, three gods are envisioned as having separate domains and spheres of influence that coalesce into an omnipotent whole. In this primary respect, tritheism differs from cosmic dualism, which often posits two divine powers working in theologic or spiritual opposition.