- Ocean Engineering (Fire) Ltd
- Ocean Safety Ltd
- Ocean View
- Olaer Fawcett Christie (previously Fawcett Christie Hydraulics Ltd.)
- OLEUS BV
- Omerin
- ONURSAN Co. Ltd.
- Orange Hydraulics
- Orbitalum Tools GmbH
- Orts GmbH Maschinenfabrik
- Outreach Ltd
- OYSTER COMPANY DOO
- OZEN-IS
- OZKAN DEMIR CELIK SANAYI A.S.
- OZSAY DENIZ NAKLIYATI A.S.
- Pacific Coast Marine Industries LLC
- PALFINGER MARINE NETHERLANDS BV (previously Palfinger Ned Deck)
- PANELFA,S.L.
- PARKER POLAND Sp. z o.o.
- PAROC POLSKA Spolka z o.o.
- PBS Turbo s.r.o.
- PBUCH S.A.
- PCC Prodex Sp. z o.o.
- Perlwitz Armaturen GmbH
- Pesbo SA
- Peter Cremer GmbH
- Peter Taboada, S.L.
- Petrokraft AB
- Phoenix Hydraulics
- Pilgrim International Limited
- PILSEN STEEL s.r.o.
- Pintsch Bubenzer GmbH
- Plain Sailing Communications Ltd.
- Planex Projektierungs GmbH
- PM Automatyka Przemyslowa SC
- Podszuck GmbH
- Point Distribution Limited
- PolarMarine Scandinavia
- Polipodio S.r.l., Enrico
- Portmere Rubber Ltd
- Portner GmbH
- PPS POWER PARTS SUPPLY BV
- Precision Polymer Engineering Ltd.
- Precision Technology USA, Inc.
- PRO NAUTAS B.V. GmbH
- Proco Products, Inc.
- Production Departy
- PTR Holland B.V.
- PZL-DEBICA Stock Company Refrigeration Equipment Factory
- QPC FIBER OPTIC Inc.
- Quality Monitoring Instruments
- R Toes + ZN BV
- R&D Marine Ltd
- R&M Ship Tec GmbH
- R&M Ship Technologies GmbH
- Ra In Ho Co. Ltd
- Radio Holland Group
- Radio Zeeland DMP America
- Radomir Metal Industries JSC
- Ralco Europa, S.L.,
- RAVEBO BRIELLE BV
- Rayco-Wylie Systems
- RAYTHEON ANSCHUETZ GmbH
- Reggiana Riduttori S.r.l.
- REICH-KUPPLUNGEN
- Reintjets
- Reliable Pumps Consultants, Inc.
- REMAT BV
- REMOR SA
- Renk AG - Augsburg
- RENK Aktiengesellschaft
- RENK Aktiengesellschaft Rheine Works
- RESITA RENK
- RESMAR LTD
- RHC Deutschland GmbH
- RHC Heavy Machinery Limited
- Rheintacho UK Ltd.
- Rickmeier GmbH
- RICOEurope Ltd
- Ridderinkhof BV
- RIVERTRACE ENGINEERING Ltd.
- RJE International, Inc.
- ROB HEIJKOOP TRADING BV
- Robinson & Liddell Ltd
- Rochem UF-Systeme GmbH
- Rolf Janssen GmbH Elektrotechnische Werke
- Rolla SP Propellers SA
- ROLLS-ROYCE PLC.
- Roodhart Marine Services BV
- RopeBlock BV
- Rotodyne Ventilatoren b.v.
- ROWAN & BODEN MARINE Ltd.
- Roxtec BV
- Roxtec International AB
- RS Aqua Ltd
- Rubber Design BV
- Rudolf Rost Sperrholz GmbH
- RWO GmbH Marine Water Technology
- S MAN AB
- S&B Beschlaege GmbH