This internet study explored the mediating effects of anxious and avoidant attachment on the link between relationship equality discrepancy and relationship satisfaction among 75 cohabitating U.S. and Canadian women's same-sex couples. Multiple regression results indicated that both anxious and avoidant attachment were found to mediate the relationship between dyadic equality discrepancy and relationship satisfaction, suggesting that the more partners perceived their relationships to be unequal, the more individual partners' fears and discomforts about their relationships increased, and in turn, anxious and avoidant attachment was associated with reduced relationship satisfaction. Results reinforced the importance of equality within women's same-sex relationships; clinical implications are discussed in light of the connection between equality and attachment for adult sexual minority women.