Helicops gomesi, also known commonly as the São Paulo keelback and cobra d'água in Brazilian Portuguese, is a species of snake in the family Colubridae.

The specific name, gomesi, is in honor of Brazilian herpetologist João Florêncio Gomes.

[2] H. gomesi is found in the Brazilian states of Goiás, Mato Grosso do Sul, Minas Gerais, Paraná, and São Paulo.

[1][3] The preferred natural habitats of H. gomesi are forest and savanna.

[1] H. gomesi may attain a snout-to-vent length (SVL) of 76 cm (30 in).