This study aims to identify the factors that influence the intention of Brazilian Navy military personnel to share knowledge through social media. The intention is to broaden the discussion on the use of social media in knowledge management within public institutions, particularly in the context of the Armed Forces. The research is a survey-based study with the participation of 125 respondents, and the data was analyzed using confirmatory factor analysis and structural equation modeling. The study revealed that perceived usefulness, perceived ease of use, and reciprocity have an influence on the behavioral intention to share knowledge through social media.