Objective: To analyze the social support of people with HIV/AIDS from the perspective of the Social Determinants of Health Model. Method: This was a cross-sectional study conducted in 2015 in an infectious disease outpatient clinic. The sample was made up of 116 people with HIV/AIDS. The data was collected through interviews, using a sociodemographic form and a social support scale. The data was analyzed using descriptive statistics, and Student's t-tests and Mann-Whitney tests were performed to determine the association between social support and the social determinants of health. Results: Total social support was satisfactory, emotional support was infl uenced by smoking (p=0.0432) and instrumental support, by the number of people in the household (p=0.0003). The main source of instrumental and emotional support was relatives living outside the household, corresponding to 66.7% and 56.1%, respectively. Conclusion: It was found that smokers havelower emotional support and people living alone received less instrumental support. Descriptors: HIV; Acquired Immunodefi ciency Syndrome; Social Support; Social Determinants of Health; Public Health. RESUMO Objetivo: analisar o suporte social de pessoas com HIV/Aids, na perspectiva do Modelo da Determinação Social da Saúde. Método: estudo transversal, realizado em 2015, em um ambulatório de infectologia. A amostra constituiu-se de 116 pessoas com HIV/Aids. A coleta de dados ocorreu mediante entrevista, utilizando-se o formulário sociodemográfi co e a escala de suporte social. Os dados foram analisados por estatística descritiva, e realizaram-se os Testes T de Student e Mann-Whitney para verifi car a associação entre o suporte social e os determinantes sociais de saúde. Resultados: o suporte social total foi satisfatório, o suporte emocional foi infl uenciado pelo uso de tabaco (p=0,0432) e o instrumental, pelo número de pessoas no domicílio (p=0,0003). A principal fonte de apoio do suporte instrumental e emocional foram os familiares externos ao ambiente doméstico representando 66,7% e 56,1%, respectivamente. Conclusão: evidenciou-se que fumantes apresentam menor suporte emocional e que pessoas que residem sozinhas recebem menor suporte instrumental.