Surname Madslien (Madslien 
) , in all the world, is a very rare family name. The surname Madslien is characteristic of Northern Europe, particularly Norway, where it is a rare surname, and the United Kingdom, where it is an extremely rare surname. Much less frequently, Madslien is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Madslien | Norway, Spain, United Kingdom |
| anders madslien Norwegian politician (b. 1938) |
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| jorn madslien British journalist (b. 1967) |
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| valborg madslien Norwegian ski orienteer (b. 1973) |
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| knut madslien researcher (ORCID 0000-0002-2886-4949) |
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| jørgen madslien Norwegian ski orienteer (b. 1994) |
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