伊智提哈德（阿拉伯语：اجتهاد；iğtihād）是伊斯兰教法的专有名词，形容单独诠释法源（古兰经和圣行）来作出法律裁决的进程。与其相反的是塔格利德（Taqlid），即阿拉伯语里的「模仿」。

伊智提哈德与什叶派贾法里派紧密相连。诸如约瑟·沙赫特（Joseph Schacht）等学者认同「伊智提哈德之门」在10世纪的逊尼派法学（费格赫）里已被「关闭」，意味着伊智提哈德不在逊尼派当中实行。一些伊斯兰法律的现代学者（如瓦埃勒·哈拉格）表示虽然逊尼派穆斯林更看重塔格利德，但伊智提哈德也成为了逊尼派传统里的重要部分。

Ijtihad (Arabic:اجتهاد‎ ijtihād, "diligence") is an Islamic legal term that means "independent reasoning" or "the utmost effort an individual can put forth in an activity." It is recognized as the decision-making process in Islamic law (sharia) through personal effort (jihad) which is completely independent of any school (madhhab) of jurisprudence (fiqh). As opposed to taqlid, it requires a "thorough knowledge of theology, revealed texts and legal theory (usul al-fiqh); an exceptional capacity for legal reasoning; thorough knowledge of Arabic." By using both the Qu'ran and Hadith as resources, the scholar is required to carefully rely on analogical reasoning to find a solution to a legal problem, which is considered to be a religious duty for those qualified to conduct it. Thus, a mujtahid is recognized as an Islamic scholar who is competent in interpreting sharia by ijtihad. Today, there are many different opinions surrounding the role of ijtihad in modern society.