British and Irish History
- Relations with Denmark
- Relations with France
- Relations with Germany
- Relations with Greece
- Relations with Italy
- Relations with Japan
- Relations with Russia
- Relations with Spain
- Relations with Sweden
- Republicanism
- Restoration (England)
- Rhodri
- Riot Act
- Ritualism
- Rochdale Society of Equitable Pioneers
- Roman Catholicism
- Rome (Ancient state). Army
- Roundheads
- Royal Air Force
- Royal College of Music