Objective: To analyze the violence by intimate partner in adolescence in view of the categories of gender, gender violence and generation. Method: This is a descriptive and exploratory research that utilizes quantitative methods. The data was collected in a public school of Technical Education and Higher Education in the Brazilian city of Curitiba, state of Paraná. The participants were 111 adolescents whose ages ranged from 15 to 19 years old. Data collection was conducted by means of an anonymous and self-fillable instrument, composed of closed questions and the CADRI scale. Results: It was found that 91% of the participants reported perpetrating at least one of the forms of violence measured in this study and 90.1% reported having suffered at least one of the forms of violence. The verbal/emotional violence showed the highest frequency of perpetration (90.1%) and victimization (89.2%), followed by suffered (32.4%) and perpetrated (27.9%) sexual violence, suffered (25.2%) and perpetrated (21.6%) threats, suffered relational violence (22.5%), perpetrated (22.5%) and suffered (18%) physical violence and perpetrated relational violence (8,1%). For almost half of the participants, the experience and perpetration of physical and sexual aggression occurred in conjunction with the experience and perpetration of psychological violence. Violence by an intimate partner during the adolescence constitutes an early form of gender violence. Gender constructs determined the occurrences of suffered and perpetrated violence and also seem to naturalize and legitimate these attacks. The inequality of power between generations may cause more vulnerability to violence by intimate partner in adolescence. Furthermore, in relation to aggression, the category of generation enabled us to understand the emergence of new forms of perpetration and victimization determined by historical and social changes. Conclusions: The historical and social construction of masculinity and femininity, as well as the inequalities of power established by those constructs, converge with the imbalance of power between generations. Thus, gender and generation are determinants of violence by intimate partner in adolescence, as well as of the vulnerability of adolescents to this phenomenon.