Last name Posin (Posin 
, Позин 
, פוסין 
) , in the world, is a rare cognomen. The cognomen Posin is habitual in Denmark, where it is a rare surname, Russia, and Belarus. Measured by absolute frequency, it is the most numerous in Russia, the United States, and Germany. Very seldom, Posin is the forename as well as the last name.
| mendl posin holocaust victim, b. 1870-09-15, CZ (b. 1870) |
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| daniel q. posin American nuclear physicist, US (b. 1909) |
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| kathryn posin American choreographer (b. 1943) |
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| jerry posin American musician, US (b. 1951) |
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| arie posin film director, US (b. 1970) |
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