| Mr Ammar Alanbuki | Urologist | Warren Rd | Tue 08:30–12:30, 17:30–20:00 |
| Mr Andrew Symes | Urologist | Warren Rd | Fri 09:00–12:30 |
| Mr Wang Hot Pot Brighton | Hot pot restaurant | 60 Queens Rd | Thu 11:30–20:30 |
| MrCutters | Gardener | Richmond Terrace | Daily Open 24 hours |
| MS Roofing Supplies Brighton | Roofing supply shop | Bell Tower Industrial Estate, Roedean Rd | Mon–Fri 07:00–16:30 |
| mybackpain.co.uk | Physical rehabilitation center | 27 Hillcrest | Mon 09:00–18:00 |
| Naija Corner Restaurant | West African restaurant | 60 Preston St | Mon–Sat 13:30–23:00 |
| Namo Thai Restaurant | Brighton | Thai restaurant | 24 Ship St | Thu 12:30–14:30, 17:30–21:00 |
| Naomi Spurr Studio | Facial spa | 25 Clifton Hill | Thu 09:00–21:00 |
| Neil's Steels Ltd | Steel fabricator | East, Aldrington South, Basin, Basin Rd S | Mon–Fri 08:00–16:30 |
| Neoma | Leather goods shop | 40 Trafalgar St | Tue–Sat 11:00–18:00 |
| NEON ART by Ash | Neon sign shop | 19 Market St | Tue–Sun 09:00–17:00 |
| New School Kebab Wrap & Grill | Kebab shop | 38 Lewes Rd | Mon 14:00–23:00 |
| Newlands Property | Commercial property estate agent | Clarence House, 30-31 North St | Mon–Fri 09:00–17:00 |
| NHR Organic Oils Ltd | Aromatherapy supply shop | 24 Chatham Pl | Mon–Fri 09:00–17:00 |
| Nicholas Dexter: Landscape & Garden Design. Brighton and Hove | Sussex | Landscape designer | Metway, 55 Canning St | Thu 08:30–18:00 |
| Nineteen Seventy Three Ltd | Stationery manufacturer | 11 North St | Mon–Thu 09:00–17:15 |
| Noodle Bang 拌碗拌粉面馆 | Chinese noodle restaurant | 61 Queens Rd | Mon 11:30–21:30 |
| North Laine Bazaar | Fleamarket | 5, 5A Upper Gardner St | Thu 10:00–17:30 |
| North Laine Music | Musical instrument shop | 44 Sydney St | Mon–Fri 11:30–17:30 |
| Oddballs Brighton | Skate shop | 24 Kensington Gardens | Thu 10:00–18:00 |
| Odysea Signs | Signage Experts in Brighton, Sussex. | Neon sign shop | Unit 19, Hove Enterprise Centre, Basin Rd N | Thu 08:00–17:30 |
| Old Police Cells Museum | Museum | Town Hall | Thu 13:00–15:00 |
| Omnitech Support | Computer repair service | 1a Sillwood Terrace | Thu 09:00–18:30 |
| Online Rheumatoid Clinic | Rheumatologist | 26 Elder Cl | Mon–Fri 08:00–18:00 |
| OptaNet | Internet service provider | 132 Queens Rd | Mon–Fri 08:30–17:30 |
| Organic Zoo | Clothing wholesaler | Trading Estate, Unit 4 Victoria Rd | Mon–Fri 08:00–16:00 |
| Overgrown | Organic shop | 42 Sydney St | Sun 11:00–18:00 |
| Ozsu Fish UK Ltd. | Fish farm | 95 Ditchling Rd | Mon–Fri 09:00–17:00 |
| P Kirkwood Ltd | Leather goods shop | 71a Hollingbury Rd | Mon–Fri 10:00–16:00 |