| Cake Inn Peterborough | Cake shop | 489 Lincoln Rd | Daily 09:30–20:30 |
| Calmababy | Baby swimming school | Botolph Bridge Trading Estate, 8, Oundle Rd | Mon 07:30–19:00 |
| Calmabody Yoga & Pilates | Yoga studio | Calmabody, 8 Botolph Bridge Est, Oundle Rd | Mon 07:30–19:00 |
| CAMEO Early Intervention in Psychosis | Mental health clinic | 169 London Rd | Mon–Thu 09:00–17:00 |
| Central Co-op Funeral - Stanground | Funeral home | Peterborough Rd | Daily Open 24 hours |
| Chartered Institute of Export and International Trade | Professional association | Export House, Minerva Business Park Lynch Wood | Mon–Thu 08:30–17:00 |
| Cheyney Court - Anchor | Housing association | Orton Malborne, Peterborough PE2 5NY | Mon Open 24 hours |
| Chopstix - Peterborough Xtra | Chinese noodle restaurant | 17 A1, Great N Rd | Daily 10:30–22:00 |
| City of Worship | Christian church | ortongate centre, Unnamed Road | Sun 11:00–14:00 |
| CityGate Chambers Ltd | Barrister | 96 Bridge St | Mon–Fri 08:00–18:00 |
| CKH Beauty & Aesthetics | Eyelash salon | 49 North St | Tue–Fri 11:00–21:00 |
| CKS Group Ltd | HVAC contractor | Unit 3 | Mon–Fri 08:00–18:00 |
| Clariti Digital | Internet marketing service | Thorpe Lea Rd | Mon–Fri 08:00–19:00 |
| Clear Space Clearance & Removals | House clearance service | Unit 22 Second Drove | Mon 09:00–18:00 |
| Clearlake Cleaning Ltd | Carpet cleaning service | 28 Chippenham Mews | Mon 09:00–17:00 |
| Complementary Health Clinic | Osteopath | 14 Warbon Ave | Thu–Fri 09:00–19:00 |
| Compote Counselling | Counsellor | 31 Svenskaby | Mon–Fri 09:00–16:00 |
| Controls Engineering Solutions Ltd | Electrical engineer | 4 Fallowfield | Mon–Fri 07:00–19:00 |
| Cookes Property Management Ltd | Property rental agency | Unit 9, Wharf Road Industrial Estate | Thu–Fri 09:00–17:30 |
| Core Highways Peterborough Depot | Civil engineering | 24 Tresham Rd | Mon–Fri 07:00–15:00 |
| Craftmades Premium Handmade Shoes-Appreal-Bangles A Project of Shinelet Footwear | E-commerce service | 12 Manasty Rd | Mon–Thu 09:00–17:00 |
| Cubex Contracts Ltd | Office refurbishment service | Peterborough United Football Club, United Football Club, London Rd | Mon–Fri 08:00–16:00 |
| CUPRA Peterborough | Cupra dealer | Eastern Industries, Newark Rd | Mon–Fri 08:30–18:00 |
| Custom Choice Home Improvements | Window installation service | Unit 1, Prospect Place, Fengate | Thu–Fri 09:30–17:00 |
| Customscape LTD | Landscaper | 23 Kilbride Wy | Mon–Fri 08:00–16:30 |
| Dana’s Handyman Service | Handyman/Handywoman/Handyperson | 34 Winwick Pl | Daily Open 24 hours |
| Deafblind UK Charity Shop | General store | 7b Skaters Way | Mon–Sat 09:30–16:00 |
| Demetrio's windscreens | Auto glass repair service | 2c Church St | Mon–Sat 08:30–21:00 |
| Dermal Plus Clinic | Skin care clinic | 43 Natures Wy | Thu–Fri 09:00–20:00 |
| DiamondStarsGlass | Arts and crafts shop | 19 Fen St | Daily 09:00–17:00 |