Prejudice against men may result in emotional distress, interpersonal conflict, and impairments in a man’s view-of-self. It can be a contributing factor for explaining increased substance use and suicide by men, as well as rates of violence against men. Awareness of the prejudices men may face allows clinicians to form better alliances with their clients by helping them understand the feelings and perspectives of men who experience various forms of prejudice. This dissertation begins with an overview of the general causes of prejudice and a summary of the mechanisms that maintain a prejudice’s social acceptability. It then provides a taxonomy of different forms of the prejudices men face, as well as the mechanisms that maintain the social acceptability of prejudice against men. Finally, it describes examples of prejudice against men, applying the taxonomy put forth in this dissertation.