Mehdi Karroubi (Persian: مهدی کروبی, Mehdī Karrūbĩ; born 26 September 1937 in Aligoudarz, Lorestan) is an influential Iranian reformist politician, democracy activist, mojtahed, and chairman of the National Trust Party. He was Chairman of the parliament from 1989 to 1992 and 2000 to 2004, and a presidential candidate in the 2005 and 2009 presidential elections.

He is a founding member and former chairman of the Association of Combatant Clerics party. Karroubi is a critic of the Guardian Council and Iran's Judicial System and calls himself a follower of Iran's ex-leader Ruhollah Khomeini. By appointment of the Supreme Leader, he was a member of the Expediency Discernment Council and an advisor, posts he held until resigning from all his posts on June 19, 2005 after the first round of the 2005 presidential election. Karroubi considers himself a pragmatic reformist. He is now the head of the Etemad-e-Melli party (National Trust or National Confidence party). He has been described as a "moderate" with a "mostly rural" base of support.