Being in a satisfying romantic relationship in adolescence is associated to many short- and long-term benefits. However, more research is needed to better understand what promotes relationship satisfaction in adolescence. To address this gap, this study used a diary approach to examine the relation between disagreements and daily variations in adolescent romantic relationship satisfaction. A sample of 186 adolescents was recruited (Mage = 17.08 years, SD = 1.48; 56% female). Multilevel modeling was used to evaluate how disagreement occurrences, resolution, and resolution strategies were related to daily perceived relationship satisfaction at both the between- and within-subjects levels. At the within-subjects level, satisfaction was lower on days when a disagreement occurred, especially for girls. Adolescents also reported lower relationship satisfaction on days when they used more destructive strategies than usual, and higher relationship satisfaction on days when they successfully resolved disagreements. This study demonstrates that adolescents’ evaluations of their daily relationship satisfaction vary as function of disagreement processes.