| Hugh Barlow-Brown Guitars | Stringed instrument maker | Unit 1, 31 Quebec St | Mon–Fri 10:00–18:00 |
| Hump It Lump It Dump it | Waste-management service | 29 Sharpthorne Cres | Mon–Sat Open 24 hours |
| ImmotionVR/iVR - Brighton | Video arcade | Lower level, Churchill Square Shopping Centre, Unit 82 Russell Pl | Mon–Sat 10:00–20:00 |
| Indian Quilts Siddi Kawandi | Textile exporter | 36 Dean St | Daily Open 24 hours |
| Indian Summer | Modern Indian restaurant | 70 East St | Mon 17:00–21:30 |
| Indigo Splash Ltd | Event management company | 15 West St | Mon–Fri 08:00–18:00 |
| Infinity Pools LTD. | Swimming pool contractor | 113 Compton Rd | Mon–Fri 09:00–17:00 |
| Inglis Works | Embroidery service | 508 Falmer Rd | Mon–Thu 09:30–18:00 |
| Interphase Audio Visual - Brighton | Audio visual consultant | Barts House, Freedom Works, Black Lion St | Mon–Thu 07:30–18:00 |
| Istanbull Katz | Wine bar | 3 Little E St | Thu–Fri 17:30–23:00 |
| J Tasker Decking & Outdoor Structures | Deck builder | Thornhill Rise | Daily 08:00–18:00 |
| Jaba Yard | Ladies' clothes shop | 18 Bond St | Mon–Sat 10:00–18:00 |
| Jayar Car Parts Brighton | Car accessories shop | Business Park, Unit 14 Sea View Way | Mon–Fri 08:00–17:30 |
| Jing Institute of Massage and Complementary Medicine | Training provider | 28-29 Bond St | Mon–Thu 09:00–17:00 |
| Jones + Partners | Research and product development | Vine Street Studios, 8 Vine St | Mon–Thu 08:00–17:30 |
| JP Photographic Ltd | Photographer | 4 Burlington Gardens | Mon–Fri 09:00–17:00 |
| Julian Stephens Goldsmith | Jeweller | 37 Gloucester Rd | Mon–Tue 10:00–17:00 |
| Junior Edition | Children's clothes shop | 34 Kensington Gardens | Sun 11:00–17:00 |
| Juvenate Health & Leisure | Spa | Kings Rd | Mon–Thu 06:30–21:00 |
| Kateh Persian Restaurant | Persian restaurant | 35 Montpelier Rd | Daily 12:00–23:30 |
| Kebab House west street | Kebab shop | 61 West St | Daily 17:00–05:00 |
| Kerrie Berrie Beads and Jewellery | Bead shop | 10 Sydney St | Mon–Sat 10:30–17:30 |
| Khalil Properties | Apartment letting agency | 22 Western Rd | Mon–Fri 09:30–17:30 |
| Kickboxing Brighton | Martial arts school | Knoyle Rd | Tue 18:00–19:00 |
| Kids Endocrinology in Brighton | Pediatric endocrinologist | Nuffield Health, Hospital, Warren Rd | Mon–Fri 06:30–20:30 |
| Kitchen Academy | Cooking school | 11 Harrington Villas | Daily 09:00–17:00 |
| Korpan | Korean restaurant | Open Market, Marshalls Row | Thu 10:30–19:00 |
| Kusikuy Peruvian cuisine & Pisco Bar | Peruvian restaurant | 36 East St | Mon–Tue 16:00–22:00 |
| L. Raphael Beauty Spa & Wellness at The Grand Brighton | Spa | 97-99 Kings Rd | Thu 06:30–22:00 |
| Lala & Belles | Children's party service | 17-19 Oxford St | Sat Open 24 hours |