Kosmin or Kośmin may refer to:
- Kośmin, Lublin Voivodeship, a village in eastern Poland in Puławy County
- Kośmin, Masovian Voivodeship a village in east-central Poland in Grójec County
- Paul J. Kosmin, a historian who studies the Seleucid Empire
- Barry Kosmin, a professor of public policy and scholar of religion & culture, specifically groups unattached organisations only loosely attached to religion
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