Cognomen Olien (Olien 
) , in the entire world, is a rare family name. The family name Olien is characteristic of the Democratic Republic of the Congo, where it is a rare surname, South Africa, and Canada, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in the Democratic Republic of the Congo, the United States, and Indonesia. Very seldom, Olien is the forename as well as the last name.
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| Olien | South Africa, Canada, United States, Indonesia, Democratic Republic of the Congo |
| andrew olien American politician – Minnesota -House 1913-14 (District 17); House 1915-18 (District 13), US (b. 1860) |
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| michael david olien American ethnologist, US (b. 1937) |
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| darin olien (b. 1970) |
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