Surname Zelen (Zelen 
, زلن) , around the world, is a rare cognomen. The last name Zelen is characteristic of Southern Europe, particularly Slovenia, where it is quite a rare surname, Serbia, and Croatia. In absolute terms, it is the most numerous in the United States, Serbia, and Slovenia. Much less frequently, Zelen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Zelen | Serbia, Netherlands, United States, Croatia, Slovenia |
| jože zelen SI (b. 1830) |
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danilo zelen SI (b. 1907) |
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| marvin zelen biostatistics researcher (1927-2014), US (b. 1927) |
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| charles zelen researcher |
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| ivanka zelen researcher |
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| joyce zelen Dutch art historian, NL (b. 1988) |
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| heinrich zelen |
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