This paper provides a checklist of 15 known species of the Triatominae subfamily in Maranhão State. On the coastal São Luís Island there are a total of 10 species associated with sylvatic areas (Eratyrus mucronatus, Psammolestes tertius, Panstrongylus diasi) and periurban and urban areas (Panstrongylus geniculatus, Panstrongylus lignarius, Rhodnius nasutus, Rhodnius neglectus, Rhodnius pictipes, Rhodnius robustus and Triatoma rubrofasciata). The last was found only on São Luís Island, while the others have also been found inland. The following were not found in the coastal area: Panstrongylus megistus, Triatoma brasiliensis, Triatoma maculata, Triatoma pseudomaculata and Rhodnius brethesi. These were found mainly on the 'Chapadas' and 'Chapadões' areas in the eastern and southern parts of the State.