Rock - Sagg
- Rock truck
- Rocker shaft
- Rocker-arm
- Roll
- Roll axis
- Roller bearing
- Roller chain
- Rolling resistance
- Roof lamp
- Roof luggage rack
- Roominess
- Roots compressor
- Rotary compressor
- Rotary excavator
- Rotary intersection
- Rotary island
- Rotary valve
- Rotating beacon
- Rotor
