Muslim believe that the promised Mahdi (pbuh) is a savior and redeemer who will appear before the Day of Judgment and make the world free from oppression and injustice. Throughout the history of Islam, some liar individuals have claimed that they are the promised Mahdi, and based on this false claim and the distortion of Mahdism, they have caused people’s ideological deviation. There are various criteria to recognize these false claimants, such as social, cultural, political, etc. This research, in a descriptive-analytical way, aims to identify and examine the criteria of the false claimants of Mahdism, and tries to collect the necessary data from various sources. The obtained results from the analysis and combination of these data show that some of the most important criteria for identifying the false claimants of Mahdism are: To feign to be a faithful man and violate it, secular spiritualism, distortion, and forgery and to intersect sources and texts.