Most past research on apologies examines participants’ responses to imaginary transgressions or minor offenses against strangers. This research consequently neglects how the quality of pre-existing relationships might influence responses to apologies in everyday life. I examined whether relationship satisfaction moderated the association between apologies and forgiveness in romantic relationships by influencing perceptions of apology sincerity. Members of 60 married or cohabiting couples first assessed their relationship satisfaction. Participants then completed daily diaries, reporting transgressions by their partners, apologies by their partners, perceived apology sincerity, and willingness to forgive their partners. Apologies predicted forgiveness only for participants highly satisfied with their relationships. In addition, relationship satisfaction was positively associated with participants’ ratings of the sincerity of the apologies, which in turn predicted forgiveness. The findings suggest that, relative to less satisfied individuals, highly satisfied individuals are more forgiving following apologies, because they regard their partners’ apologies as sincere expressions of remorse.