| AIRCO Refrigeration & Air Conditioning Ltd | HVAC contractor | 2nd floor, Berkeley Square House | Daily Open 24 hours |
| AirCraft Circus Academy | Circus | Unit 7A, Mellish House, Thames-Side Studios, Harrington Way | Mon 10:00–20:30 |
| Airports Taxi Transfers | Airport shuttle service | 10-18 Manor Gardens | Daily Open 24 hours |
| AIT Home Delivery | Logistics service | Unit 1, 345 Southbury Rd | Mon–Sat Open 24 hours |
| AJ Office Supplies | Office supplies shop | 5th Floor, 16 Great Queen St | Thu 09:00–17:00 |
| Akasha Spa | Spa and health club | Hotel, Café Royal, 68 Regent St. | Daily 07:15–21:00 |
| Al Basha Restaurant | Middle Eastern restaurant | 48 Knightsbridge | Daily 10:00–00:00 |
| Al zayt Restaurant | Arab restaurant | 38 W Ham Ln | Mon–Thu 12:00–23:00 |
| Alanic Clothing : Wholesale Clothing Manufacturer UK - Private Label Clothing Manufacturers London | Sustainable Clothing UK | Clothing wholesale market place | 35 Catherine Pl, Buckingham Gate | Daily Open 24 hours |
| Alarms & Locks | Van accessories shop | 247 Chingford Mount Rd | Mon–Fri 09:30–17:30 |
| Alaz | Egyptian restaurant | 448 Chiswick High Rd. | Tue–Thu 11:00–15:00, 17:00–21:00 |
| Albion Computer Services | Computer repair service | 37 Tretawn Gardens | Mon 09:00–17:30 |
| Alexandra Palace Ice Rink | Ice skating rink | Alexandra Palace, Alexandra Palace Way | Daily 11:00–17:00 |
| Alfa Insurance Facilities | Home insurance agency | 14 Falmouth Ave | Mon–Fri 09:00–17:00 |
| Alhaji SUYA Peckham | Grill | 15 Peckham Park Rd | Mon–Thu 09:00–22:00 |
| Ali Miller London | Boutique | Muswell Hill, London N10 2BP | Mon–Sat 10:00–16:00 |
| All About Costumes | Costume hire service | York Rd | Daily Open 24 hours |
| All England Lawn Tennis & Croquet Club | Tennisverein | Church Rd | Daily Open 24 hours |
| All Greens Newington Green, fruits & vegetables London | Fruit and vegetable shop | 109 Newington Green Rd | Daily 07:00–21:00 |
| All Greens Wholesale Limited | Vegetable wholesaler | Unit 431- 433, New Covent Garden Markets, Nine Elms Ln | Mon–Thu Open 24 hours |
| All Pets Veterinary Clinic | Animal hospital | 7 Sidmouth Rd | Mon–Fri 09:00–19:00 |
| All Property Claims | Insurance agency | Rm 306, 165 The Broadway | Daily Open 24 hours |
| All That Falafel & More | Falafel restaurant | 132 Southwark St | Mon–Fri 10:30–15:30 |
| Allegiance Customs | Car restoration service | Gemma House, 39 Lilestone St | Mon 09:00–17:00 |
| Allegrostrings | Stringed instrument maker | 8 Keswick Mews | Mon–Fri 10:00–17:00 |
| Allen Briggs Hyundai | Hyundai dealer | 47-59 Chingford Mount Rd | Mon–Fri 08:30–18:00 |
| Allergy Cosmos | Air filter supplier | Unit 42, A, 99-109 Battersea Business Centre, Lavender Hill | Mon–Fri 09:00–20:00 |
| Allison Rodger Couture Designs | Fashion designer | 283 New Kings Rd | Mon–Sat 09:30–18:00 |
| Allstar Events Group | Tent rental service | Allstar Events Group, 34 Masefield Cres | Mon–Fri 08:00–18:00 |
| Alluvi Healthcare | Home health care service | 3rd Floor, 86-90 Paul St | Tue Open 24 hours |