In this paper, we focus on relationship satisfaction of European binational unions. Although such couples can be considered icons of European integration, little is known about these partnerships as well as the factors affecting relationship satisfaction. We base our analysis on the Dutch data of the EUMARR-project, a unique data set on European binational unions (n = 898). We reveal that Europeans in binational unions report higher relationship satisfaction compared to Dutch individuals in binational European and uninational partnerships. Furthermore, our analysis shows that married individuals are more satisfied compared to cohabiting individuals. Finally, having children is negatively and the availability of social support positively correlated with relationship satisfaction. The presence of children shows to be especially challenging for Dutch people in binational unions.