This thesis analyzed the process of professional socialization experienced by female police officers in the Rio de Janeiro Military Police, which results in the assumption of the police officer identity, identifying the stages of this process and the aspects or conditions that have made this course challenging, considering the transposition of the difficulties inherent in the gender stereotypes printed in this profession and the typical operational and cultural limitations of the military police career. Furthermore, this thesis aimed to: discuss the aspects or conditions that may have facilitated this process; analyze the identity elements incorporated by the interviewees, in the course of incorporating the ethos of the police officer and in the process of adaptation and socialization in this professional niche; understand the resulting identity construction from this process, which culminates in the construction of the identity of the police woman and to identify the feminine stereotyped identities traits, emphasized by the interviewees when describing themselves, that can be considered as a form of resistance to the incorporation of a masculinized and brutalized identity, such as the typical identity of the police officer. To do so, under the precepts of qualitative research, twenty-three in-depth interviews were conducted with female police officers in battalions from the State of Rio de Janeiro, and the testimonies collected were submitted to content analysis. The relevance and originality of this thesis rests on its theoretical-analytical perspective, since, in this research, theories regarding gender issues, the identity construction related to the police ethos were used, as well as theories on identity, identity construction and socialization professionals widely used in academic research and of great adherence to the objectives of this work. The results indicate that being a woman in the PMERJ is a reality full of difficulties, related to the lack of cultural preparation of this institution for the performance of these professionals. Moreover, about the typical gender stereotypes of the police profession, it is possible to infer that many interviewees perceive the gender barriers imposed on them, which places them in a position of inferiority towards their peers, due to the consensus, even reinforced by some of them, that the police officer activity is more suitable for men. Regarding the assumption of the police officer identity, a phenomenon experienced intensely by men and women, the interviewees reported the incorporation of a more authoritarian and imposing stance; a state of permanent attention, aiming at their own safety and that of their work partners and relatives; the decrease of the sensitivity and the consequent increase of a harder posture under many circumstances; the brutalization, in the form of masculinization, as strategy of survival in this androcentric environment. However, as the interviewees incorporate new elements into their identity constructions, becoming hard and fearless, these also reinforce aspects that can be interpreted as identity resistance, strongly associated with the female stereotype, in contrast to the masculine ethos of the policeman. The analysis of the identity (re) construction process of the police woman revealed how paradoxical this process is, marked by both radical changes and significant resistance.