The objective of the article is to describe the relationship between the style of attachment and the mentalization in convicted of sexual crimes that are confined in the Penitentiary and Prison Establishment of the city of Monteria-Córdoba, Colombia. A total of 96 convicted of sexual crimes participated in this quantitative, descriptive correlational and cross-sectional study. The sample consisted of 50 men divided into 6 categories according to the type of sexual offense, with an average age of 45. Sociodemographic data, attachment styles with the CaMir-R and mentalization with the 8-item RFQ were evaluated. The majority of subjects presented a greater proportion of "insecure attachment" and difficulties in mentalization. The dimension "Autonomy and resentment against parents", belonging to the type of insecure attachment, was the only one that correlated positively with mentalization.