- Rosenbauer
- Rosenberg
- Rosenberger
- Rosendahl
- ROSENLEW
- Rosenstein & Söhne
- Rosewill
- ROSIERES
- RÖSLE
- Ross
- Ross&Moor
- Rossi
- Rosslare
- ROSSLARE ENTERPRISES
- Rössler
- Rossmax
- Rossum
- Rostra
- Rostra Precision Controls
- Roswell
- Rotabroach
- Rotadent
- Rotaid
- Rotary
- Rotax
- Rotec
- Rotek
- Rotel
- Rotella
- Rotem
- Rotenso
- Rotex
- Roth
- Roth Audio
- Roth Global Plastics
- Rothenberger
- Rothenberger Industrial
- Rothenbuhler Engineering
- Rothewald
- Rotho
- Roto
- Roto-Mix