An extensive research literature finds links between mindfulness and individual well-being, while exploring the association between mindfulness and intimate relationship satisfaction has been increasingly in the research focus lately. The aim of this study was to explore the associations between facets of mindfulness, attributions of the partner’s negative behavior, and perceived relationship quality, as well as gender differences in examined variables. An online questionnaire survey was conducted with a sample of 144 men and 236 women, aged 18-35 years, that were in a romantic relationship. Participants completed Five Facet Mindfulness Questionnaire (Baer et al., 2006), Relationship Attribution Measure (Bradbury and Fincham, 1992), and Quality of Marriage Index (Norton, 1983), adapted to non-married participants. Results indicate that women are more satisfied with their relationships and that they are more inclined to observe and describe their own experiences than men, who are more prone to not reacting to different internal experiences than women. Hierarchical regression analysis indicated that variables acting with awareness, describing one’s own internal experiences and responsibility attributions contributed significantly to explaining 12% of women’s relationship quality variance. In men, only responsibility attributions were proved to be a significant predictor, and along with other examined variables explained 5.9% of relationship quality.