Baltasar Lopes da Silva (Caleijão, São Nicolau, 23 April 1907 - Lisbon, Portugal, 28 May 1989) was a writer, poet and linguist from Cape Verde, who wrote in both Portuguese and Cape Verdean Creole.
With Manuel Lopes and Jorge Barbosa, he was the founder of Claridade.
In 1947 he published Chiquinho, considered the greatest Cape Verdean novel and O dialecto crioulo de Cabo Verde which describes different dialects of creoles of Cape Verde.
He sometimes wrote under the pseudonym Osvaldo Alcântara.
Ressaca, his work of poems can be found on the CD Poesia de Cabo Verde e Sete Poemas de Sebastião da Gama by Afonso Dias.