Look up Cromwellian in Wiktionary, the free dictionary.
Cromwellian is an adjective relating to Oliver Cromwell (1599–1658), Lord Protector of the Commonwealth of England, and his era
Cromwellian may also refer to:
- Roundhead, a member of the Parlimamentarian side of the English Civil War against the Royalists
- Cromwellians, people from the Cromwellian Commonwealth of England
- The Cromwellian, a 1960s nightclub in London, England, UK