| GCL Fight Club | Boxing gym | 191 Lewes Rd | Mon 17:00–20:00 |
| GENE Commerce Limited | E commerce agency | Nile House, Projects | Mon–Fri 09:00–17:30 |
| Genesis Drainage | Septic tank service | flat 1, aylwin house, 36a Dyke Rd Ave | Daily Open 24 hours |
| GENIE Design and Print Solutions | Invitation printing service | 17 Church St | Mon–Fri 09:00–17:00 |
| Ginger Lily Florists | Florist | 93 Preston Drove | Thu 09:00–16:00 |
| Gladrags Costume Resource | Theatrical costume supplier | Unit 10, Westergate Business Centre, Westergate Rd | Tue 10:00–18:00 |
| Global Doula | Pregnancy care centre | Preston Park Ave | Daily Open 24 hours |
| Gorgeous Paper Personalised Stationery Boutique | Graphic designer | 26b W Hill Rd | Mon–Fri 09:00–17:00 |
| GRACE Adult Entertainment Club: Brighton's best strip club and lap dancing venue | Nightclub | 51-52 North St | Mon–Tue 22:00–05:30 |
| Grace and Compassion Benedictines | Religious organisation | St Mary's House, St Marys House, 37D Preston Park Ave | Mon–Fri 09:00–17:00 |
| Graduate Recruitment Bureau (GRB) Graduate Jobs | Recruiter | 4, Clifton Mews, 14 Clifton Hill | Mon–Thu 08:30–19:00 |
| Grains Of Gold | Jewellery valuer | 50-52 Meeting House Ln | Mon–Fri 10:00–17:00 |
| Grand Aesthetics Clinic | Electrolysis hair removal service | 40 Church Rd | Thu 09:30–17:00 |
| Granite, Quartz and Marble worktops | Granite supplier | 3, Beaconsfield Parade, Beaconsfield Rd | Daily Open 24 hours |
| Greek Orthodox Church of the Holy Trinity, Brighton | Orthodox church | Carlton Hill | Thu 09:00–12:00 |
| Green Timber | Tree service | 15 Jevington Dr | Mon–Sat 07:00–19:00 |
| Grove Park Healthcare | Mental health services | The Linkway | Daily Open 24 hours |
| GroWorks | Hydroponics equipment supplier | Bell Tower Industrial Estate, 4 Roedean Rd | Mon 10:00–18:00 |
| Happy Valley Pre School Brighton | Pre-school | 58 Heath Hill Ave | Mon–Fri 08:00–18:00 |
| Headway Tutors Brighton | Learning centre | 2 Montpelier Rd | Daily Open 24 hours |
| Helix Law | Legal services | Second Floor, Britannia House, 21 Station St | Mon–Fri 09:00–17:30 |
| Hextransforma Healthcare | Medical equipment manufacturer | Aspect House, 84-87 Queens Rd | Thu 09:00–17:00 |
| High Reach Systems Brighton | Crane service | D, Prospect House, Hyde Business Park | Daily 08:00–22:00 |
| HolidayTaxis Ltd | Airport shuttle service | Regus, City Centre, 106 Queens Rd | Tue Open 24 hours |
| Hollingbury Golf Course | Golf course | Hollingbury Park Golf Club, Hollingbury Golf Course, Ditchling Rd | Daily 07:00–19:00 |
| Hollingbury Park Tennis Courts | Tennis court | Ditchling Rd | Mon–Fri 08:00–20:00 |
| Holt Lodge Sheltered Accommodation - Sanctuary Housing Association | Sheltered housing | Canterbury Dr | Daily Open 24 hours |
| Home & Company Ltd | Home care service | Ground Floor, North, Pacific House, 126 Dyke Rd | Thu 09:00–17:00 |
| Horsemart | Equestrian shop | 80 East St | Mon–Fri 09:00–17:00 |
| Hot Fox Pottery | Pottery classes | 133 Hartington Rd | Fri 10:00–18:00 |