- Ocean Safety Ltd
- Ocean View
- OFFSHORE & TRAWL SUPPLY AS
- Olaer Fawcett Christie (previously Fawcett Christie Hydraulics Ltd.)
- OLEUS BV
- Omerin
- Omicron AS
- Optima Hydraulics Pty Ltd
- Optimarin AS
- Orbitalum Tools GmbH
- Orts GmbH Maschinenfabrik
- OSI Maritime Systems
- Outreach Ltd
- OWRE-JOHNSEN AS
- OXYMAT AS
- Pacific Coast Marine Industries LLC
- PALFINGER MARINE NETHERLANDS BV (previously Palfinger Ned Deck)
- Palfinger Marine Norway AS
- PANELFA,S.L.
- Parat Halvorsen AS
- Perlwitz Armaturen GmbH
- Pesbo SA
- Peter Cremer GmbH
- Peter Taboada, S.L.
- Petrochem Pipeline Supply Ltd
- Petrokraft AB
- Phoenix Hydraulics
- Pilgrim International Limited
- Pintsch Bubenzer GmbH
- Plain Sailing Communications Ltd.
- Planex Projektierungs GmbH
- PMC - Prime Mover Controls Inc
- Podszuck GmbH
- Point Distribution Limited
- PolarMarine Scandinavia
- Portmere Rubber Ltd
- Portner GmbH
- POWERBOX AS
- PPS POWER PARTS SUPPLY BV
- Precision Polymer Engineering Ltd.
- Precision Technology USA, Inc.
- Pres-Vac Engineering Aps
- PRO NAUTAS B.V. GmbH
- Proco Products, Inc.
- PTR Holland B.V.
- PYRO AS
- 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 HOLLAND NORWAY AS
- Radio Zeeland DMP America
- Ralco Europa, S.L.,
- Randers Reb International A/S
- Rapp Bomek AS
- Rapp Marine AS
- RAVEBO BRIELLE BV
- Rayco-Wylie Systems
- RAYTHEON ANSCHUETZ GmbH
- REICH-KUPPLUNGEN
- Reintjets
- Reliable Pumps Consultants, Inc.
- REMAT BV
- Renk AG - Augsburg
- RENK Aktiengesellschaft
- RENK Aktiengesellschaft Rheine Works
- RESMAR LTD
- RESON A/S
- 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
- ROCKWOOL A/S
- Rolf Janssen GmbH Elektrotechnische Werke
- ROLLS ROYCE GROUP
- Rolls-Royce Marine AS
- ROLLS-ROYCE PLC.
- Roodhart Marine Services BV
- RopeBlock BV
- Ropenhagen a/s
- 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