Westminster Business by letter: y
- Y B Gordon, Westminster
- Y B Patel, Westminster
- Y F C (London), Westminster
- Y K Consulting Ltd, Westminster
- Y London, Westminster
- Y O G Yachting Overground, Westminster
- Y W C A Central Club, Westminster
- Yaa Asantewaa Arts & Community Centre, Westminster
- Yacobs Gallery, Westminster
- Yacoub Real Estates Ltd, Westminster
- Yama Design, Westminster
- Yandex Ltd, Westminster
- Yard Bar, Westminster
- Yas On The Park, Westminster
- Yates, Westminster
- Yatra, Westminster
- Yauatcha, Westminster
- Yazco Carpets Ltd, Westminster
- Ye Olde White Horse, Westminster
- Yeatman & Kerwick, Westminster
- Yellow Earth Theatre, Westminster
- Yellowstone Construction, Westminster
- Yemen Airways, Westminster
- Yes Productions, Westminster
- Ying Hwa Ltd, Westminster
- Ylva French, Westminster
- Yo Japan, Westminster
- Yo Sushi, Westminster
- Yo Sushi, Westminster
- Yo Sushi, Westminster
- Yo Sushi, Westminster
- Yoella Salon, Westminster
- Yoga Magazine, Westminster
- Yogi's, Westminster
- Yohji Yamamoto Inc, Westminster
- Yolan Interior Design Consultants Ltd, Westminster
- Yoo Ltd, Westminster
- Yoon, Westminster
- York Estates, Westminster
- Yorkshire Building Society, Westminster
- Yoshino & Co, Westminster
- Yoshino & Co (UK) Ltd, Westminster
- Yoshino Ltd, Westminster
- You Project Management Ltd, Westminster
- Younes Seddik, Westminster
- Young & Son, Westminster
- Young & Talented, Westminster
- Young Britains Foundation, Westminster
- Young Cheng, Westminster
- Young Cheng, Westminster
- Young Cheng Chinese Restaurant, Westminster
- Young Concert Artists Trust, Westminster
- Young England, Westminster
- Young England Ltd, Westminster
- Young Smartees Of Marble Arch, Westminster
- Younguns Agency, Westminster
- Your School Site, Westminster
- Youth Hostels Association, Westminster
- Youth Justice Board For England & Wales, Westminster
- Youth Music Theatre (UK) Ltd, Westminster
- Youth Project International, Westminster
- Youth-Full Ltd, Westminster
- YSC Ltd, Westminster
- Ysh Media, Westminster
- Yulan, Westminster
- Yumi Restaurant, Westminster
- Yungs, Westminster
- Yves Saint Laurent Rive Gauche, Westminster
- Yvette Of Knightsbridge, Westminster
- Yvonne Couture, Westminster