António Chainho (born Santiago do Cacém, 1938) is a Portuguese fado guitarist. He has worked with many of the great names in fado music, like Hermínia Silva, Carlos do Carmo and José Afonso, and world music, like Paco de Lucía. He has also recorded and toured extensively with the Lisbon-based São Toméan singer Marta Dias.
In 1998, Chainho contributed "Fado Da Adiça" and "Interlude: Variações Em Mi Menor" to the AIDS benefit compilation album Onda Sonora: Red Hot + Lisbon produced by the Red Hot Organization.