Firmino Baleizão da Graça Sardinha, (born 10 September 1945 in Beja, Portugal), known as Osvaldinho, is a former Portuguese footballer who played as defender for Desportivo Beja, Vitória Guimarães, Boavista F.C., Benfica de São Tomé e Príncipe, Marítimo and Gil Vicente. Osvaldinho played 2 caps for the Portugal national team.