- Twin Peaks Hospitality
- Twisted Rope
- U Diverse
- U.S. Embassy in The Hague
- U.S. Embassy The Hague
- Uaas
- UBC
- Ubique Systems Uk Ltd
- UBS
- UBS Europe SE Netherlands Branch
- UCC-Services BV
- uhlsport GmbH
- UIZ Zentrum
- Ukje.nl
- UL LLC
- Ultimate Party
- UMAI
- Umbra
- Uncultured Schwein
- Undutchables
- Unger Germany GmbH
- Unilever
- Uniper
- UNIQ GmbH
- UNIQLO
- Uniqlo Europe LTD
- UNIQLO/GROUPE FAST RETAILING /Comptoir des cotonniers
- UNIT4
- Unit4 Business Software Holding
- United Academics
- United Airlines
- United Biosource Corporation
- United Pop B.V.
- Unitedprint.com SE
- Unitherm Food Systems
- Universal Electronics BV
- Universal Info Service
- Universal Pictures International B.V.
- University of Amsterdam
- University of Groningen
- University of Twente
- Universum
- Universum Communications Sweden AB
- UNOde50
- Unseen Photography B.V.
- UPakWeShip EU BV