Last name Oltmann (Oltmann 
) , all over the world, is quite a rare cognomen. The surname Oltmann is characteristic of Germany, where it is quite a rare surname, Denmark, where it is a rare surname, and Austria. Not in comparison with a country's population, the name is most common in Germany, the United States, and Brazil. Very seldom, Oltmann is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Oltmann | Brazil, Canada, United States, Germany, Denmark |
| oltmann thyen german Merchant and Consul of the Grand Duchy of Oldenburg, DE (b. 1821) |
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| oltmann jaburg German painter (1830-1908), DE (b. 1830) |
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| oltmann wilken bracklo DE (b. 1834) |
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| oltmann johann dietrich ahlers German shipowner (1848-1910), DE (b. 1848) |
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| heinrich oltmann (b. 1892) |
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| jan luiken oltmann (b. 1926) |
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| eckhard oltmann (b. 1963) |
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| jörn oltmann DE (b. 1966) |
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| sarah oltmann researcher |
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| oltmann riemer researcher (ORCID 0000-0002-5147-2206) |
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| emma oltmann |
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| maxime oltmann German rugby union player, VU (b. 1995) |
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