Cognomen Mihalj (Mihalj 
, Михаљ) , throughout the world, is quite a rare surname. The surname Mihalj is habitual in Southern Europe, particularly Croatia, where it is quite a common surname, Bosnia and Herzegovina, and Serbia, where it is quite a rare surname. Also, Mihalj is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mihalj | Croatia, Bosnia and Herzegovina, Serbia, Germany, Hungary |
| miroslav m mihalj chess player (b. 1973) |
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| boris mihalj SI (b. 1966) |
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| martina mihalj researcher |
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| mario mihalj researcher |
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| maks mihalj researcher (ORCID 0000-0002-6298-7985) |
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| ivan mihalj Croatian volleyball player, RU (b. 1990) |
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