The evidence of the interrelationships between adult attachment, conflict resolution style and relationship quality in couple relationships shows some inconsistencies and it is mostly based on English-speaking adult samples, as well as on individuals’ rather than on both couple members’ reports. Therefore, the aim was to examine the associations between adult attachment, conflict resolution style and relationship quality from a dyadic approach. A sample of 405 heterosexual young couples completed online the brief version of the Experiences in Close Relationships-Revised Questionnaire, the respondent version of the Conflict Resolution Styles Inventory, and a 4-item measure of relationship quality. Avoidance attachment showed a stronger negative correlation than anxiety with relationship quality. Withdrawal and conflict engagement styles were more highly correlated with avoidance and anxiety, respectively. At a dyadic level, relationship quality was negatively predicted by actor avoidance attachment and positively predicted by partner relationship quality. No actor or partner effects of conflict resolution style on relationship quality were observed. Overall, partners with higher attachment anxiety and avoidance reported more dysfunctional conflict resolution styles and less satisfaction with the relationship.