The purpose of the present study was to identify if there are significant diferences when comparing the dyadic adjustment and adult attachment in Lima citizens that live in a couple. A cross-sectional study was conducted, it was based on a descriptive, comparative and non experimental design with self-reporting measurements. Participants were 180 citizens of Lima, older than 20 years and that lived in cohabitation with a partner. They answered two surveys regarding their adult attachment and dyadic adjustment. In order to analize group differences, the statistics Kruskal Wallis, Mann-Whitney U test and student’s t-distribution were used. The group with secure attachment style present a higher level of dyadic adjustment in their four dimensions and on the global scale, while those with fearful attachment present the lowest level of adjustment. Males had a higher level of satisfaction and confidence in the dyadic adjustment scale than women. The group in early adulthood had a higher level of anxiety than those in middle adulthood. Adult attachment would be a factor that influences the level of dyadic adjustment of the couple. The analysis by dimensions of the dyadic adjustment gives a diferent perspective on how to observe and approach the dynamics of the couple.