| Arctic Ice | Ice supplier | Ashmead Business Centre, North Cres | Mon 09:00–20:00 |
| Are They Safe Private Investigators | Private investigator | 1st Floor, 2 Woodberry Grove | Daily Open 24 hours |
| Arepa & Co Venezuelan Restaurant - Haggerston | Venezuelan restaurant | 58A De Beauvoir Cres | Mon–Thu 12:00–22:00 |
| Aria One Six Eight | Furniture store | 168 Upper St | Mon–Sat 10:00–18:30 |
| Arla Brasserie | Brasserie | 475-477 High Rd. Leyton | Mon–Fri 08:00–21:00 |
| Aroma Buffet W12 | Shepherds Bush | Buffet restaurant | West 12 Shopping Centre, Unit B,1st floor, West12 Shopping Centre | Mon 12:00–15:00, 17:00–22:00 |
| Aroma Tandoori Indian Takeaway | North Indian restaurant | Unit 5-6, Greyhound Ln | Daily 11:30–22:00 |
| Articulate Music | Band | 40 Fernwood Ave | Daily Open 24 hours |
| Artisa Spa | Massage spa | 359 High Rd. Leyton | Mon–Sat 10:00–22:00 |
| ArtNHer London | Handicraft | Studio 69, 2nd floor, Arebyte Studios, 25-27 Camden Rd | Tue–Sat 11:30–16:30 |
| ASG Community Gymnastics Club | Gymnastics academy | Arch 11 Byron Cl | Daily 08:00–21:00 |
| Ashbourne Healthcare Services | Home health care service | Ashbourne House, 35 Harwood Rd | Daily Open 24 hours |
| Asif Chaudry, Oesophageal Cancer Surgeon, Gastric Cancer Surgeon | Surgical oncologist | The Royal Marsden, 203 Fulham Rd. | Daily Open 24 hours |
| Astons Law | Criminal defence lawyer | First Floor, 85 Great Portland St | Daily Open 24 hours |
| atis Borough Yards | Restaurante de comida saludable | 9 Dirty Ln | Mon–Thu 11:00–20:00 |
| atis Eccleston Yards | Restaurante de comida saludable | 1-2 Eccleston Yards | Mon–Thu 11:00–21:00 |
| Auction Property - Property Auctions in London | Estate agent auctioneer | 7 Bell Yard | Daily 09:00–18:00 |
| Audi City Wimbledon (Sales) | Audi dealer | 50 Kingston Rd | Mon–Fri 08:30–18:00 |
| Audio Gold | Audio-visual equipment supplier | 308-310 Park Rd | Mon–Sat 10:00–18:00 |
| Auto Boutique London | Vehicle storage facility | 87 Brompton Rd | Daily 09:00–17:00 |
| Auto Store Motor Factors | Auto parts store | 755 Green Lanes | Mon–Tue 09:00–18:00 |
| Autograf Restaurant | Polish restaurant | 488 W Green Rd | Mon 16:30–22:00 |
| Aya Lebanese Cuisine South Wimbledon | Lebanese restaurant | 195-197 Merton Rd | Daily 11:30–23:00 |
| B Bagel Swain's Lane | Bagel shop | Unit 2, 1 Swain's Ln | Mon–Thu 07:00–19:00 |
| Bab Al Yemen - Edgware rd | Yemeni restaurant | 143 Edgware Rd | Mon–Thu 12:00–23:30 |
| Babur | Asian restaurant | 119 Brockley Rise | Mon–Sat 12:00–14:30, 17:30–23:00 |
| Bag Manufacturer in UK - Oasis Bags | Wholesale Bags Suppliers UK | Plastic bag supplier | 35 Catherine Pl | Daily Open 24 hours |
| Balfe's Bikes Islington | Bicycle store | 33 Essex Rd | Mon–Wed 08:00–19:00 |
| Bali Bali | Restaurante indonesio | 150 Shaftesbury Ave | Mon–Thu 12:00–22:00 |
| BAM Karaoke Box | Victoria | Karaoke bar | 74 Victoria St | Mon–Wed 14:30–00:00 |