This study investigated the effects of a self-compassion intervention on negative cognitive states and selfcompassion in varsity women athletes. Athletes who self-identified as being self-critical were randomly assigned to a self-compassion intervention (n = 29) or attention control group (n = 22). The self-compassion intervention consisted of a psychoeducation session and writing components completed over a 7-day period. Measures of self-compassion, state self-criticism, state rumination, and concern over mistakes were collected pretreatment, at 1 week posttreatment, and at a 4-week follow-up. A mixed factorial MANOVA with follow-up post hoc tests demonstrated moderate-to-strong effects for the intervention at posttest and follow-up (Wilks’s Λ = .566, F (8, 42) = 4.03, p < .01, η² = .43). The findings demonstrate the effectiveness of the self-compassion intervention in managing self-criticism, rumination, and concern over mistakes. Fostering a self-compassionate frame of mind is a potential coping resource for women athletes dealing with negative events in sport.