- For other uses, see Oliver.
- See Cromwell for other articles with titles that contain, either by relationship or by coincidence, this character's surname.
Oliver Cromwell (25 April 1599 – 3 September 1658) was an English military and political leader who fought for republican ideals.
In the mid 21st century British astronomer John Burke once complained to Zefram Cochrane that the Optimum Movement was worse than Cromwell and the government he had created. (TOS novel: Federation)
Abernathy Kirk, an ancient relative of James T. Kirk, served under Cromwell in his fight against the House of Stuart in order to establish a republic in England. (TOS novel: Timetrap)