Surname Riolo (Riolo 
) , all around the world, is quite a rare cognomen. The cognomen Riolo is characteristic of Malta, where it is quite a common surname, Italy, where it is quite a rare surname, and Switzerland. In absolute terms, it most frequently occurs in Italy, the United States, and Argentina. Very seldom, Riolo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Riolo | Philippines, Italy, Indonesia, United States, Argentina |
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vincenzo riolo Italian painter (1772-1837), IT (b. 1772) |
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| vincenzo riolo Italian politician, IT (b. 1847) |
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| salvatore riolo Italian politician, IT (b. 1876) |
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daniel riolo French-Italian journalist, FR (b. 1970) |
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simone riolo volleyball player, IT (b. 1993) |
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| vincent riolo 20th century Maltese philosopher, MT (b. 1947) |
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| rick l. riolo complex systems researcher (b. 1950) |
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| davide del popolo riolo Italian science fiction writer (1968-), IT (b. 1968) |
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| david riolo Australian rugby league footballer, AU (b. 1972) |
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| alessandro riolo footballer, IT (b. 1978) |
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| giulia riolo researcher |
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| mario riolo researcher |
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| giovanni da riolo Italian painter, IT |
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| paola riolo researcher (ORCID 0000-0002-0298-3691) |
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| stefano riolo Italian mathematician, IT |
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