Southwark Business by letter: y
- Y & S Consulting, Southwark
- Y Club, Southwark
- Y K Ho, Southwark
- Y K L Stainless Steel Fabrications, Southwark
- Y Patel, Southwark
- Y Sobhy, Southwark
- Yachting Monthly, Southwark
- Yachting World, Southwark
- Yachtline, Southwark
- Yannis Motors, Southwark
- Yara, Southwark
- Yates Estate, Southwark
- Yellowfig, Southwark
- Yemmy Textiles & Fashions, Southwark
- Yeomans IT Consulting Ltd, Southwark
- Yes Yes Barbers, Southwark
- Yesil Irmak, Southwark
- Yi-Ley, Southwark
- Ying's Herbal Clinic, Southwark
- Youmoda, Southwark
- Young Parents Project, Southwark
- Your Best Friend, Southwark
- Your Life, Southwark
- Your Selection, Southwark
- YourPlaceMarketing, Southwark
- Yours International, Southwark
- Youth Development Project, Southwark
- Youth Hostels Association, Southwark
- Youth Music (National Foundation For), Southwark
- Yun Hai, Southwark
- Yungs, Southwark
- Yvonne Wilcox, Southwark