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ABSTRACT. Cunha N.C., Cordeiro M.D., Bravo S.A.C., Matos P.C.M., Almosny N.R.P. & da Fonseca A.H. [Seroepidemiology of Toxoplasma gondii in dogs in the State of Rio de Janeiro.] Soroepidemiologia de Toxoplasma gondii em cães no estado do Rio de Janeiro. Revista Brasileira de Medicina Veterinária 38(supl. 3): 114-121, 2016. Departamento de Saúde Coletiva Veterinária e Saúde Pública, Faculdade de Veterinária. Universidade Federal Fluminense, Vital Brazil, Niterói, RJ, Brazil. E-mail: firstname.lastname@example.org Toxoplasmosis is a serious public health problem worldwide as it can cause prenatal and neonatal morbidity and mortality in humans. Although dogs are not definitive hosts of T. gondii, they play an important role in the mechanical dissemination of oocysts. This study aimed to carry out a seroepidemiological investigation of anti-Toxoplasma gondii antibodies in domestic dogs from seven municipalities in the state of Rio de Janeiro, Brazil. A crosssectional epidemiological study was carried out to evaluate the profile of anti-Toxoplasma gondii IgG antibodies in dogs from canine sera from different municipalities in the state of Rio de Janeiro. The municipalities studied were Cachoeiras de Macacu, Guapimirim, Itaboraí, Magé, Resende, Seropédica and Silva Jardim. The detection of antibodies of the IgG class anti-Toxoplasma gondii was performed using the indirect enzyme immunoadsorption (ELISA) assay and the statistical analyzes used were the chi-square test and the prevalence ratio. Of the 651 samples tested, 300 were reactive for T. gondii, representing a relative frequency of 46.08% of seroreactive dogs. It was concluded that dogs are good sentinels for evaluations of risk for occurrence of T. gondii, emphasizing those coming from rural areas and that there was no difference in the occurrence of serorreative dogs in front of different municipalities studies of the state of Rio de Janeiro.