Surname Koelzer (Koelzer 
) , in all the world, is quite a rare last name. The cognomen Koelzer is habitual in Germany, where it is a rare surname, the United States, and Brazil, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Koelzer | Germany, France, Spain, Brazil, United States |
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kelsey koelzer American ice hockey player and coach, US (b. 1996) |
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| winfried koelzer (b. 1937) |
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| dietmar koelzer German cinematographer, DE (b. 1950) |
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| scott koelzer college basketball player (1971–1973) Montana State |
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| viktor h. koelzer researcher |
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