| Dietitian Gillian | Dietitian | Mount Lennox, 683 Antrim Rd | Thu–Fri 09:30–16:00 |
| Digital DNA | Media company | Clockwise Offices, 48-60 High St | Mon–Fri 09:00–17:00 |
| Dilly & Dolly’s Ann Street | Brunch restaurant | 24 Ann St | Mon–Tue 08:00–17:00 |
| Discount Beds Belfast | Bed shop | 8 Templemore Ave | Thu 10:00–17:00 |
| DiveClub Northern Ireland | Diving centre | 36 Milewater Dr | Mon 09:00–17:00 |
| DL Kirkpatrick & Son Ltd (DLK Photo) | Fotógrafo | 6, 6 Dargan Cres | Mon–Fri 09:00–17:00 |
| Dogzone NI | Dog day care centre | 250 Ballygowan Rd | Mon–Fri 07:00–19:00 |
| Donburi Rice Bowl by Kamakura | Japanese restaurant | 18 Holywood Rd | Mon–Thu 12:00–21:00 |
| Donkey Work Design | Industrial design company | 68-72 Newtownards Rd | Mon–Thu 08:00–17:00 |
| Donnelly Honda Belfast | Honda dealer | 69-73 Glenmachan St | Mon–Wed 08:30–17:30 |
| Doorways | Door supplier | 143 Northumberland St | Mon–Thu 08:00–17:00 |
| Douglas Huston | Agentes inmobiliarios | 4 Malone Rd | Mon–Thu 09:00–17:00 |
| Drawing Office One Venue for Weddings and Events | Wedding venue | Titanic Hotel, 8 Queens Rd | Daily Open 24 hours |
| Drvn Coaching Club | Personal trainer | 79 Cregagh Rd | Mon 06:30–09:00, 17:00–20:00 |
| Dundela Photo Lab | Photo lab | 17 Belmont Rd | Mon–Fri 11:00–16:00 |
| Dundonald International Ice Bowl | Ice skating rink | 111 Old Dundonald Rd | Mon–Fri 10:00–17:00 |
| Dundonald Library | Library | 14 Church Rd | Mon 10:00–17:00 |
| Dundonald Nurseries | Garden centre | 70 Old Dundonald Rd | Thu 08:30–17:30 |
| Dundonald Post Office | Post office | 756 Upper Newtownards Rd | Daily 08:00–20:00 |
| Dunn Landscapes | Landscape designer | 54 Knightsbridge Park | Mon–Fri 08:30–17:00 |
| Dunnes Stores | Department store | 3-11 High St, Corn Market | Mon–Wed 09:00–18:00 |
| East Belfast Dental & Implants | Dental implants provider | 65 Cregagh Rd | Thu 09:00–17:00 |
| East House Asian Cuisine | Chinese takeaway | 50 Upper Newtownards Rd | Mon–Tue 16:30–22:30 |
| EastSide Visitor Centre | Visitor centre | 402, A20 | Mon–Fri 07:30–18:00 |
| EDO Restaurant | Tapas restaurant | 3, CAPITAL HOUSE, Unit 2 Upper Queen St | Tue–Sat 12:00–21:30 |
| efpgyms | Physical fitness programme | 297 Ormeau Rd | Mon–Fri 08:00–16:00 |
| Egle Couture | Dressmaker | 205 Woodstock Rd | Tue–Sat 10:00–18:00 |
| Electronic Centre Sound & Light | Electronics retail and repair shop | 16 College Square E | Mon–Sat 09:00–17:30 |
| Elite 4 Trading & Grading | Trading card shop | Unit B5 & B6, Fountain Centre, 11 College St | Mon–Wed 10:00–17:00 |
| Ellisons Jewellers Belfast (Ellison Brothers Ltd) | Jewellery store | 3a The Fountain Centre, College Street | Mon–Sat 09:30–17:15 |