Last name Diethelm (Diethelm 
) , all over the world, is quite a rare surname. The surname Diethelm is habitual in Western Europe, particularly Switzerland, where it is quite a common surname, Germany, where it is a rare surname, and Austria. Not in comparison with a country's population, it is the most numerous in Switzerland, Germany, and the United States. Likewise, Diethelm is the forename as well as the last name.
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| Diethelm | Germany, Switzerland, France, United States, Poland |
| peter diethelm (1656-1712) (b. 1656) |
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| johann caspar diethelm (b. 1705) |
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| arnold diethelm (1828-1906), CH (b. 1828) |
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| hermann diethelm (1836-1898), CH (b. 1836) |
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andré diethelm French politician, FR (b. 1896) |
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josef diethelm Swiss politician (1914-1978), CH (b. 1914) |
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pascal diethelm Swiss econometrician and tobacco-control activist, CH (b. 1944) |
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| beat diethelm (1902-1982), CH (b. 1902) |
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cornelia diethelm Swiss journalist, CH (b. 1954) |
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markus u. diethelm Swiss businessman, CH (b. 1957) |
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| oskar diethelm CH (b. 1897) |
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barbara diethelm Swiss painter, CH (b. 1962) |
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| walter diethelm Swiss graphic artist (1913-1986), CH (b. 1913) |
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| hermine diethelm Austrian film editor (1915-1997), AT (b. 1915) |
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stephan diethelm Swiss musician and educationist, CH (b. 1965) |
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