| Layaly Lounge | Middle Eastern restaurant | 27D Queensway | Daily 16:00–23:00 |
| Legend One | Japanese restaurant | Unit 2A, 344 Avebury Blvd | Daily 12:00–14:30, 17:00–22:00 |
| M1 Drainage Service | Drainage service | Bletchley, Milton Keynes MK3 6NA | Mon Open 24 hours |
| Marks & Spencer | Department store | 2 Sunset Walk, Burns Way | Mon–Sat 08:00–20:00 |
| Mercedes-Benz of Milton Keynes | Mercedes-benz dealer | Greyfriars Ct | Mon–Fri 08:30–18:30 |
| Milk & Beans Coffee Roasters | Coffee roastery | Kiosk A, Lloyds Court, 659 Silbury Blvd | Wed–Fri 08:00–15:00 |
| Milton Keynes - Window Repairs | Glazier | 199a Avebury Blvd | Daily Open 24 hours |
| Milton Keynes Gutter Guy | Cladding contractor | 34 Walbank Grove | Daily Open 24 hours |
| Milton Keynes Security Ltd | Security system installation service | 2 Wharfside | Daily Open 24 hours |
| Milton Keynes Urgent Care Service at Milton Keynes University Hospital | Urgent care centre | Milton Keynes Hospital, Standing Wy | Daily Open 24 hours |
| Mini First Aid Milton Keynes and Northampton | Training provider | Broadpiece | Daily Open 24 hours |
| Miracle Temple Assemblies Of God Church | Assemblies of god church | 35 Barton Rd | Tue 20:00–21:30 |
| MK Waste Disposal and Recycling Centre | Recycling centre | 10 Newport Rd | Daily 08:00–17:00 |
| Mkherbal | Herbalist | 20 The Spinney | Daily Open 24 hours |
| Moores Fish & Chips | Fish & chips shop | 1 Maida Vale | Sun 16:00–20:30 |
| Mountain Of Glory Church | Church | east wing,castle house, mount farm,, Dawson Rd | Daily 08:00–18:00 |
| Mr Shifta Man And Van Service | Removals service | 78 Sunningdale Way | Daily 07:00–19:00 |
| Murder Mystery Events by Murder One | Event planning service | Bucks, 111 Kingsfold | Daily Open 24 hours |
| Mursley Farm Shop | Tienda de productos agrícolas | Oliver's Field, Whaddon Rd | Mon–Sat 09:00–17:00 |
| Muscle Hut Milton Keynes | Gym | 11 Bridgeturn Ave | Mon–Fri 06:00–22:00 |
| National Radio Centre | Tourist attraction | Jemima Way, Sherwood Dr | Daily 09:30–17:00 |
| Navara Beauty | Beauty salon | Unit 25, 53, Midsummer Place opp Victoria's Secret store , Saxon Gate East | Mon–Wed 09:30–18:00 |
| Neath Hill Restaurant | Indian takeaway | 9 Tower Cres | Daily 17:00–23:00 |
| New Bradwell Community Centre | Community centre | Church St | Daily 08:00–23:00 |
| New Bradwell Sports Association | Sports club | Bradwell Rd | Mon–Fri 19:00–23:00 |
| New City Church Milton Keynes | Evangelical church | Oakgrove School, Venturer Gate | Sun 10:30–13:00 |
| Normandy House | Sheltered housing | 2 Laser Cl | Daily Open 24 hours |
| Ole Tapas Bar | Tapas restaurant | Triangle Bldg, 60 Wolverton Park Rd | Tue–Thu 12:00–14:30, 17:30–22:00 |
| Open International College for Complementary Therapies | Acupuncture school | Ste E, Regency Court, 214 Upper Fifth St | Thu–Sun 09:00–17:00 |
| Optic-Art Studio | Photography studio | 109 Linceslade Grove | Mon–Thu 09:00–20:00 |