| Copier Repair Service | Printer repair service | Knowlhill, Milton Keynes MK5 8HL | Mon–Fri 09:00–17:00 |
| Corzo & Wood, Jewellery, Gifts and Workshops | Gift shop | Unit 2, The Barn, Olivers Field, Whaddon Rd | Mon–Sat 10:30–16:30 |
| Crafty Vibes (Milton Keynes) | Children's party service | Minorca Grove | Daily 09:00–17:00 |
| Cravo Carpentry & Interiors | Carpenter | 314 Midsummer Blvd | Mon–Fri 08:00–18:00 |
| Criminal Defence Milton Keynes (CDMK) | Criminal defence lawyer | 62 Queensway | Mon–Fri 09:00–17:00 |
| Crossroads Resort | Kennels | Buckingham Rd | Mon–Sat 09:00–11:45, 16:00–17:00 |
| Crown Accountancy Services Limited | Bookkeeping service | 29a, Stratford Office Village | Mon 10:00–17:00 |
| Crown Pavilions Buckinghamshire | Garden building supplier | Newport Rd | Mon–Sat 09:00–17:30 |
| Crownhill Building Services | General contractor | Unit B7A, Denbigh Business Centre 23 First Avenue West | Mon–Fri 09:00–17:00 |
| Curtain Maker - bespoke curtains and roman blinds | Interior decorator | 24 Burholme | Fri 09:00–17:00 |
| CW Plant Hire | Tool rental service | Chesney Wold | Mon–Fri 07:30–17:30 |
| D Pizza Guy | Mobile caterer | 1 Weavers End | Mon–Tue 11:00–21:00 |
| Dancebox Studios & Theatre Works | University | 218 Upper Fifth St | Mon–Fri 08:00–20:00 |
| Daniel chapman antique furniture restoration and French polishing | Antique furniture restoration service | 43 Buttermere Cl | Mon 08:00–19:00 |
| Danwood | Copy shop | ALERON House, Unit 1 Seebeck Pl, Whittle Ct | Mon–Fri 08:30–17:00 |
| DB Pack | Packaging supply shop | 10 Claridge Dr | Mon–Thu 08:00–22:00 |
| DDC Dental Academy | Dental school | University Hospital | Mon 09:00–17:00 |
| Deeper Awareness | Reiki therapist | 1 Fripp Gardens | Thu 09:00–20:00 |
| Deli 24 | Food manufacturer | Dawson Rd | Mon–Fri 06:00–22:00 |
| Denbigh School | Sixth form college | Burchard Cres | Mon 08:30–15:00 |
| Dental Implants - Dr. Pav Khaira | Dental implants provider | Dental The Spinney, ROKA, Newport Rd | Wed 08:00–17:00 |
| detailR LTD | Valeting service | 106 Tanners Dr | Mon–Fri 08:30–17:00 |
| Digital Printing UK | Digital printing service | 300 S Row | Mon–Thu 08:30–18:30 |
| DJ Moore Lofts Milton Keynes | Home builder | 18 Newton Rd | Mon–Fri 08:30–16:30 |
| Dove Nail House and Training Academy | Beauty therapy college | 9 Drakes Mews | Fri 09:00–18:00 |
| Downs Barn School | Primary school | 69 Downs Barn Blvd | Daily 08:30–16:00 |
| Dressdown.co.uk | Screen printer | 70 Burners Ln | Mon–Fri 09:00–17:00 |
| Dudley Plant Hire Ltd. | Plant and machinery hire | 84A Station Rd | Mon–Fri 08:00–17:00 |
| DW Roberts Opticians | Optician | 16 High St | Thu 09:00–18:30 |
| Dynamic Technologies Europe Limited | Electronics company | Unit 3, Integra, Thornton Chase | Mon–Fri 08:00–18:00 |