Zaporozhian Host (or Zaporizhian Sich) is a term for a military force inhabiting or originating from Zaporizhia, the territory beyond the rapids of the Dnipro River in what is Central Ukraine today, from the 15th to the 18th centuries.
- Zaporozhian Cossacks, generally
- Zaporozhian Sich, a semi-autonomous Cossacks' polity in the 16th–18th centuries
- Registered Cossacks, Zaporizhian warriors who were recorded as cossacks in official registries of the Polish-Lithuanian Commonwealth between 1572 and 1648
- Cossack Hetmanate, a Cossack state between 1649 and 1764