| City Picnic | Family restaurant | 6 Castle St | Mon–Thu 11:30–20:00 |
| Ciyms | Sports complex | Circular Rd, Belmont Rd | Mon–Sat 09:00–23:00 |
| Clean Master NI | Carpet cleaning service | 143 Lagmore Dl | Mon–Fri 07:00–20:00 |
| Clean Vision | Window cleaning service | 25 Coolnasilla Ave | Mon 06:30–18:00 |
| Cleaning Contractors NI | Servicio de restauración de daños por incendios | 2 The Mount, Woodstock Link | Thu 09:00–17:00 |
| Clear Dental Dundonald | Dentist | Upper Newtownards Road, Dundonald | Mon–Fri 08:30–17:30 |
| CMG Cunningham Dickey Solicitors | Personal injury lawyer | 18 May St | Mon–Fri 09:00–17:00 |
| Colinwell Masonry Products Ltd | Concrete product supplier | 37 Colinglen Rd | Mon–Fri 08:00–17:00 |
| Collins Furniture | Furniture | 140-144 Andersonstown Rd | Mon–Sat 09:00–17:30 |
| CompareNI | Agencia de seguros | Fl 4, Blackstaff Studios, 8-10 Amelia St | Thu Open 24 hours |
| Computer Science Building | University department | 16A Malone Rd | Mon–Thu 08:00–22:00 |
| Cool IT Refrigeration | Air conditioning repair shop | Twin Spires Centre, 155 Northumberland Street | Mon–Sat 09:00–21:00 |
| Core Physio and Strength | Physical therapy clinic | The Arches Centre, 11-13 Bloomfield Ave | Mon–Fri 08:30–20:00 |
| Corporate AV Hire | Audio visual equipment hire service | 2 Woodstock Link | Mon–Tue 10:00–18:00 |
| Court Credit Union Ltd | Credit union | 271 Shankill Rd | Tue 11:00–16:00 |
| CPR Belfast | Mobile phone repair shop | 379 Shankill Rd | Mon 09:30–17:30 |
| Cregagh Road Civic Amenity Site | Household waste recycling centre | 350 Cregagh Rd | Mon–Tue 09:00–17:30 |
| Creightons Autostore | Auto parts store | 82-84 Upper Lisburn Rd | Mon–Fri 08:30–17:15 |
| Cryo Fitness Hub | Fitness centre | 367 Antrim Rd | Mon 12:00–21:00 |
| Cushman & Wakefield - Commercial Real Estate Services | Agencia de bienes inmuebles comerciales | 5 Oxford St | Mon–Fri 09:00–17:30 |
| Cushman & Wakefield NI | Agencia de bienes inmuebles comerciales | 6th floor, 10-20 Lombard St | Mon–Fri 09:00–17:30 |
| Dashin' Hounds | Pet groomer | 12c Comber Rd | Mon–Fri 09:00–17:00 |
| Data Recovery NI | Servicio de recuperación de datos | 7, Scottish Provident Building, Donegal Square West | Mon 09:00–17:00 |
| David Murphy Towing | Trailer manufacturer | 182 Belfast Rd | Mon–Thu 08:30–13:00, 14:00–17:30 |
| Dawn Crothers Artist Studio | Art school | UnitA, 378 Belmont Rd | Thu 10:00–15:00 |
| Dawson Wright Hardware | Hardware shop | 355 Woodstock Rd | Thu 09:00–17:00 |
| Decorators Touch Belfast Ltd | Wallpaper shop | 756 Upper Newtownards Rd | Thu 07:30–17:00 |
| Decowell Restoration, Conservation, and Decoration | Painting | 371 Woodstock Rd | Mon–Fri 09:00–17:00 |
| Dental Care Dundonald | Dentist | 789 Upper Newtownards Rd | Mon 09:00–18:30 |
| Diamond Bright Cleaning NI - Belfast | Servicio de limpieza doméstica | 2 Woodstock Link | Thu 08:00–20:00 |