| Claypot Spice | South Indian restaurant | 81 Abbey Rd | Mon 16:00–22:00 |
| Clean & Dry Doncaster | Carpet cleaning service | Unit 2 Churchill Buildings, Churchill Business Park, Churchill Rd | Daily Open 24 hours |
| Clear Spark Exterior Cleaning | Pressure washing service | 44 Brecks Ln | Mon–Sat 08:00–20:00 |
| Clickdoors kitchens and Bedrooms | Kitchen supply shop | Lake Enterprise Park, Sandall Stones Rd | Mon–Fri 09:00–17:00 |
| Clutter Busters Clearance | House clearance service | Marsh Gate | Daily 08:00–20:00 |
| Color Coded Workwear | Work clothes shop | Doncaster DN4 8QN | Mon–Fri 09:00–17:00 |
| Colwill Contracting | Excavating contractor | Ashlea/Main Street | Mon–Fri 07:30–17:00 |
| Community First Credit Union Limited | Credit union | Unit 6, Colonnades Shopping Centre | Mon–Fri 10:00–14:00 |
| Complete Catering Service | Caterer | 5, Unit 5, Kirk Sandall Industrial Estate, Sandall Ln | Daily 08:00–17:30 |
| Conisbrough Castle | Castle | Castle Hill | Fri 10:00–17:00 |
| Conisbrough Community Library | Library | Old Road, Conisbrough | Mon–Tue 10:00–13:00 |
| Conisbrough Dental Partners - Doncaster | Dental clinic | 4 Station Rd | Mon 08:30–18:00 |
| Conisbrough Motor Company Ltd | Used car dealer | Sheffield Rd | Mon–Fri 09:00–17:30 |
| Cook Stars Kids Cooking Classes Doncaster South. | Cooking class | The Bakery Hub Phantom Court | Mon–Fri 09:00–17:30 |
| Cooplands Of Doncaster | Bakery | 221 Skellow Rd | Mon–Sat 08:00–15:00 |
| Coppa Bar & Eatery | Asian fusion restaurant | 2 Plantation Rd | Wed–Thu 12:00–22:00 |
| Cornerstone Gelato | Ice cream shop | Unit 12, The Hive, Yorkshire Wildlife Park | Fri 10:00–18:00 |
| COUTURE LA FEMME Designer Dress Studio & Showroom | Ladies' clothes shop | Fl Studio, Danum House, 6a Lower Ground, S Parade | Mon–Tue 10:00–16:30 |
| Craig Ritchie Construction | Excavating contractor | 118 Aberconway Cres | Mon–Tue 07:30–19:30 |
| Craven Wildsmith | Property management company | 33 Northgate | Mon–Tue 09:00–17:00 |
| Crayden Wedding Photography | Wedding photographer | Cavendish Court, 3, S Parade | Mon–Tue 09:00–17:00 |
| Cream Hut - Armthorpe | Dessert shop | Tadcaster Court, Doncaster Rd | Daily 14:00–22:00 |
| Crystal Clear Ear Care | Hearing aid repair service | 12 Rushy Moor Ave | Mon–Fri 09:00–17:00 |
| CTS Doncaster Laboratory | Civil engineering company | Bootham Lane Industrial Estate, Bootham Ln | Mon–Fri 08:00–17:00 |
| Cuddle Hugs | Massage spa | STMARGARETS, Main St | Mon–Fri 09:00–17:00 |
| Cultman Collectables | Collectibles shop | 27 Bowers Fold | Mon–Tue 09:00–16:30 |
| Curvus Timber | Saw mill | White Pheasant Farm, Common Ln | Mon–Fri 09:00–16:00 |
| Cusworth Hall | Country park | Cusworth Ln | Mon 10:00–16:00 |
| CW Roofing & Building Services LTD | Roofing service | 21 Blue Bell Ct | Mon–Sat 07:30–19:30 |
| D Hughes Welldrillers Ltd | Well drilling contractor | 8 Birchwood Ct | Mon Open 24 hours |