| Bird Plus UK | Bird shop | Unit 11, Alresford Business Centre | Fri 11:00–18:00 |
| Biryani Planet Colchester | South Indian restaurant | 3 Military Rd | Daily 13:00–22:00 |
| Bkini | Swimwear shop | 9 Market Hill | Tue–Fri 09:30–17:00 |
| Black Jacket, The Events & Venues Team | Event management company | Woodland Business Park, Unit 1 Lower Works | Mon–Fri 09:00–17:30 |
| Blackwater Law | Personal injury lawyer | A12, Commercial Hub, London Rd | Mon–Thu 09:00–17:30 |
| Blue Owl | Pottery classes | Nayland Rd | Wed 10:00–12:30 |
| Blue Sky Printing | Photography shop | 33 Sir Isaac's Walk | Fri 09:30–17:30 |
| Bluepoint Technologies Ltd | Telecommunications equipment supplier | 890 The Crescent, Colchester Business Park | Mon 09:00–17:00 |
| BOLT Music Tuition - Guitar, Bass and Drum Lessons | Music school | BOLT Music Tuition, Godbolts Nurseries, Coggeshall Rd | Thu Open 24 hours |
| Bourn Hall Fertility Clinic, Colchester, Essex | Fertility clinic | Charter Court, Newcomen Way | Mon–Wed 08:00–17:00 |
| Brett Concrete | Ready-mix concrete supplier | Ford Ln | Mon–Tue 07:00–17:00 |
| BRIDGE Wind Management | Environment renewable natural resources | Lodge Park Business Centre, Lodge Ln | Mon–Fri 09:00–17:00 |
| Brightlingsea Harbour Commissioners | Port authority | 4 Copperas Rd | Wed 08:00–17:00 |
| Brookhouse Interior Design & Refurbishment | Interior construction contractor | Unit 8, Easter Park, Axial Way | Fri 08:00–16:30 |
| Bubble Tealicious | Bubble tea store | Unit 2, 44-45 St Botolph's St | Daily 10:00–22:00 |
| Buffalo Joe’s | American restaurant | Campus, University of Essex | Mon–Fri 08:30–20:00 |
| C & R Plumbing & Heating Contractors LTD | Plumber | 19 Gainsborough Cl | Mon–Fri 09:00–17:00 |
| Cadman Cranes | Mobile Crane Hire | Crane service | Lindsey House, Severalls Industrial Park, Brunel Way | Mon–Fri 07:30–17:00 |
| Calibre Windscreens | Auto glass repair service | Ingrams Piece | Daily Open 24 hours |
| Camperite Leisure | Camping shop | Flyover Nurseries, Coggeshall Rd | Mon–Sat 09:00–17:30 |
| Capital Screeding Ltd | Concrete contractor | 31, Broomfield House, Landswood park | Daily Open 24 hours |
| Car Cosmetics | Car body shop | Gun Hill House, Ipswich Rd | Fri 08:00–17:30 |
| Carluccio's | Italian restaurant | 152 High St | Mon–Sat 09:00–17:30 |
| Carter Bishop Creative Agency | Advertising agency | 6 Coppice End | Tue–Thu 09:00–18:00 |
| Carter | Newlove Interiors Ltd | Interior fitting contractor | Unit 7b, The Orchards Business Park | Mon–Fri 08:00–17:30 |
| Castle Counselling Service Ltd | Counsellor | Blackwell House, Coggeshall Rd | Mon–Fri 08:00–21:00 |
| CESM Installations | Contractor | 51 Geoffrey Blackwell Cl | Mon 07:00–22:00 |
| CFM Sound - PA Hire | Event management company | 26 High St | Mon–Fri 09:30–16:30 |
| Chimtec | Chimney services | 54 Maldon Rd | Mon–Fri 09:00–17:00 |
| Choice Foods Colchester | Asian grocery shop | 37A St Botolph's St | Mon–Sat 09:00–20:00 |