Family name Hardtke (Hardtke 
) , all over the world, is quite a rare surname. The cognomen Hardtke is habitual in Germany, where it is quite a rare surname, the United States, where it is a rare surname, and Brazil, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Hardtke | Brazil, Argentina, United States, Canada, Germany |
| alwin caesar hardtke (b. 1905) |
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david h. hardtke American data scientist with background in nuclear physics, US |
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| hans-jürgen hardtke German university professor, engineer, botanist and mycologist, DE (b. 1944) |
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| frank hardtke German lawyer, DE (b. 1960) |
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| jason hardtke American baseball player, US (b. 1971) |
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| christian siegfried hardtke (b. 1968) |
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| christian s. hardtke researcher |
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| svenja hardtke researcher |
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| jan-david hardtke Dr. rer. nat. Freie Universität Berlin 2015 |
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| sylvie hardtke |
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| sonja hardtke |
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| thomas hardtke (b. 1984) |
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