- Oceans Technologies
- OCee Design Limited
- Océ-Italia S.p.A.
- OCEM
- Ocenášek a.s.
- OCEVI IMPIANTI, SRL
- Ochmann Schlafkultur
- Ochoa-Stella Richter
- ochra restauro snc
- Ochre
- Ochsner Wärmepumpen GmbH
- Ocm Clima
- OCM Clima srl
- OCMA
- OCML
- OCML
- Ocmoa Serramenti Srl
- OCQ - Outdoor Cooking Queen
- Ocra restauri
- OCRA srl
- Ocram adv
- ocram costruzioni
- ocram costruzioni s
- OCRAM SAS
- OCRAM-CLIMA
- OCRIM, SPA
- Ocrùm
- OCS
- OCS GROUP INTERNATIONAL
- OCS SYSTEM S.R.L.
- OCSAM IMPIANTI SRL MACCHINE PER L'INDUSTRIA
- OCTAEVO
- octagona
- OCTAGROUP
- Octa-Light Bulgaria Plc
- OCTANE ARCHITECT & DESIGN
- OCTANT
- Octant Concept
- Octava Arquitectura
- OCTAVIO AMADO
- octávio fonseca arquitecto
- Octávio Raja Gabaglia
- OCTIRAN
- Octo
- October Design Studio
- Octogon doo
- OCTOGONO LDA MOBILIARIO E DECORACAO
- ocube
- Ocuris GmbH