Yamandu Costa (Passo Fundo, January 24, 1980), sometimes misspelled Yamandú, is a Brazilian guitarist and composer. His main instrument is the violão de 7 cordas, the Brazilian seven-stringed nylon guitar.

Yamandu began to study guitar at age seven with his father, Algacir Costa, leader of the group Os Fronteiriços (The Frontiersmen) and mastered the instrument after studying with Lúcio Yanel, an Argentine virtuoso who lived in Brazil. At age fifteen, Yamandu began study Brazilian Southern folk music, Argentina and Uruguay.