Ruminative thought patterns, defined as repetitive negative self-focused attention, are considered an avoidant coping strategy for managing stress. As trans and nonbinary (TNB) individuals commonly experience prejudice and discrimination in response to their gender identities (i.e. minority stressors), rumination over these stressors may contribute to heightened risk of psychopathology in these groups. Although rumination is a general risk factor for eating disorder (ED) psychopathology, no studies to date have examined whether eating- or gender-related ruminative patterns relate to maintenance of ED psychopathology for TNB individuals. This cross-sectional study investigated whether levels of rumination (both gender-related and ED-specific) mediated the relationship between minority stress and ED psychopathology.