Piyadasa is a name. Notable people with the name include:
Piyadasa Gunasekera (1915–1980), Sri Lankan actor Piyadasa Ranasinghe (1946–1989), Sri Lankan political activist Piyadasa Sirisena, Ceylonese novelist, patriot, journalist, temperance worker and independence activist Piyadasa Wijekoon (1940–2003), Sri Lankan actor Redza Piyadasa (1939–2007), Malaysian artist