| Chic Tailoring & Alterations | Tailor | 120 Commercial Rd | Mon 09:00–17:30 |
| Chimney Sweep Swindon | Chimney sweep | 27 Iffley Rd | Daily 07:00–17:00 |
| Ciao Eatalia | Italian restaurant | 26 Swindon St | Tue–Wed 17:30–22:00 |
| CKF International Film Festival | Festival | Bath Rd | Daily 09:00–17:00 |
| Classic Occasions - Wedding Car Hire | Chauffeur service | 10 Lowes Cl | Mon–Fri 08:00–18:00 |
| Clever Property Investing | Property investment | 2-3, Dorcan Business Village, Murdock Rd | Mon–Thu 08:30–18:00 |
| Clove Atelier (Royal Wootton Bassett) | Modern Indian restaurant | 147 High St | Tue–Thu 17:00–22:00 |
| CM Building and landscaping Ltd | Drainage service | 5 Berton Cl | Thu 07:30–18:00 |
| Coate Water Country Park | Country park | Marlborough Rd | Daily Open 24 hours |
| Coatstone Surfacing Ltd | Road construction company | Westmead, Swindon SN5 7FP | Mon–Fri 09:00–17:00 |
| Coe Construction | Building firm | 67 County Rd | Daily 08:00–20:00 |
| Collvett Ltd | Uniform shop | Unit5 Rivermead / Rivergate | Mon–Fri 09:00–17:00 |
| Com Masters Computer & Laptop Repair | Computer repair service | 15 Wainwright Cl | Mon–Thu 09:00–21:00 |
| Copy Color Ltd | Digital printer | The Pigeon House, Pigeon House Ln | Mon–Thu 09:00–18:00 |
| Core Elements Training | Sports massage therapist | 2, charnwood court, Newport St | Mon 09:00–17:00 |
| Costello Production Group | Event management company | Unit 37, BSS House, Cheney Manor Rd | Mon–Fri 09:00–17:00 |
| Cotswold Surgical Partners | Plastic surgery clinic | Unit 13, Interface Business Park | Mon–Fri 08:30–17:00 |
| Covingham Square Post Office | Post office | 2 Covingham Dr | Mon–Sat 06:00–18:00 |
| Craig Foreman Photography | Wedding photographer | 27 Berenger Cl | Mon–Thu 09:00–17:00 |
| Crave Motors | Motor vehicle dealer | 4 Aspen Close | Mon–Fri 09:30–18:00 |
| Cricklade Dental Practice | Dentist | 104 High St | Mon–Thu 08:30–13:00, 14:00–17:00 |
| Cricklade Osteopaths | Osteopath | 12 High St | Mon 09:00–18:30 |
| Cross Street Travel | Coach and minibus hire | Gipsy Ln | Thu–Fri Open 24 hours |
| CSnotepad | Telephone answering service | 2 Blackworth | Mon–Fri 08:30–17:30 |
| CUPRA Swindon | Cupra dealer | Great Western Way | Mon–Fri 08:30–18:00 |
| Data Cabling Installations | Contractor | Elmcott, City Cor | Mon–Fri 08:00–19:00 |
| Decorative Concrete Specialists (DCS) | Concrete contractor | Unit 8, Kingsdown Industrial Estate, Kingsdown Rd | Mon–Fri 09:00–17:00 |
| Del Mundos (Swindon) | Tapas restaurant | 23 Wood Street, 23 Wood St | Tue–Fri 09:30–14:30, 17:00–23:00 |
| Delta Tennis Centre | Tennis court | Welton Rd | Sat 09:00–16:00 |
| Dick Lovett MINI Swindon | MINI dealer | Ashworth Rd | Mon–Fri 08:30–18:00 |