- VTE-Filter GmbH
- VULKAN Kupplungs und Getriebebau
- W&O Supply
- WALTER STAUFFENBERG GmbH & Co KG
- WALTON ENGINEERING COMPANY Ltd.
- Wandfluh AG
- Warren-Morrison Valves Ltd
- Wartsila (Hamworthy) Water Systems Ltd
- Wartsila Hamworthy Inc (Houston)
- Wartsila Krystallon Ltd
- WATERMOTA LTD.
- Webasto Thermo & Comfort SE
- Weicon GmbH & Co KG
- Wesco Navy GmbH
- Westermann Kaltetechnik GmbH
- Westmark BV
- WETCAB LTD.
- Whisper Power BV
- Wilden Pump & Engineering Co
- Wilhelm Kopp Zellkautschuk GmbH & Co.
- Wilhelm Layher GmbH & Co. KG
- WILHELM SANDER FERTIGUNG GmbH
- WILHELM SCHLEY GmbH &Co. KG
- WILHELMSEN MARINE ENGINEERING
- WILLBRANDT KG
- WINSLOW LifeRaft Co Inc
- Winteb VOF
- Wiper Solve Marine Ltd.
- WIRED OCEAN LIMITED
- WISKA Hoppmann & Mulsow GmbH
- Witzenmann GmbH
- WNL Marine Electronics
- Wolf Safety Lamp Co Ltd
- WOMA GmbH
- WOMEB
- Woodsons of Aberdeen Ltd
- World Wide Metric Inc.
- Worldwide Marine and Industrial Spares
- Wouter Witzel EuroValve
- YEKE DENIZCILIK AS
- Yilmaz Denizcilik Nakliyat ve Gemi San.Tic.Ltd.Sti
- Young & Cunnigham Eddie Spence
- Zamech Marine Sp. z o.o. Sp.k.
- Zeework Ltd
- ZELMET Ltd.
- Zet Marine
- ZETKAMA S.A.
- ZF Marine GmbH
- ZOELLNER Signal GmbH
- Zorya PA