R series
- Adventure R series – paramotors for gliders
- BL R-series engine – gasoline car engines
- Dennis R series – coach chassis
- Ford R series – busses
- International Harvester R series – trucks
- Mack R series – heavy-duty trucks
- R series – Renard number series in mathematics
- Samsung Galaxy R series – Android smartphones
- Scania R series – trucks
- Sony Ericsson R series, a series of cell phones