Last name Piyadasa (Piyadasa 
) , across the world, is quite a rare cognomen. The surname Piyadasa is habitual in Sri Lanka, where it is quite a common surname, Singapore, where it is a rare surname, and Malaysia. Much less frequently, Piyadasa is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Piyadasa | Australia, Singapore, United Kingdom, Sri Lanka, Malaysia |
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piyadasa sirisena LK (b. 1875) |
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| piyadasa gunasekera Sri Lankan actor (1915–1980) (b. 1915) |
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| redza piyadasa Malaysian artist, art critic and art historian (1939-2007), MY (b. 1939) |
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| piyadasa wijekoon Sri Lankan actor (1940-2003), LK (b. 1940) |
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| piyadasa ranasinghe Sri Lankan politician and JVP secretary (1948−1989), LK (b. 1948) |
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| piyadasa ck researcher |
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