Family name Montelongo (Montelongo 
) , throughout the world, is a common last name. The surname Montelongo is habitual in Mexico, where it is quite a common surname, Uruguay, where it is quite a rare surname, and the United States. In absolute terms, it most frequently occurs in Mexico, the United States, and Spain. Much less frequently, Montelongo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Montelongo | Mexico, Uruguay, United States, Canada, Spain |
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gregorio di montelongo Roman Catholic bishop, IT (b. 1200) |
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michael montelongo American politician, US (b. 1955) |
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| olivia de montelongo Mexican poet, MX (b. 1940) |
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| néstor montelongo Uruguayan association football player, UY (b. 1955) |
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| armando montelongo American businessman (b. 1970) |
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| isidro o montelongo alfaro researcher (ORCID 0000-0002-4011-4075) |
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| rené fujiwara montelongo Mexican politician |
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| sergio a montelongo researcher |
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| tinguaro montelongo entomologist and ornithologist |
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| lia montelongo actress, US |
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| yunuen montelongo researcher |
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| victor montelongo botanist |
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| gregorio de montelongo Roman Catholic archbishop |
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| mario montelongo researcher |
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| bruno montelongo Uruguayan footballer, UY (b. 1987) |
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