| F&F Clothing | Clothing shop | Highwoods Square | Mon–Sat 06:00–00:00 |
| Fabdiggs, Homes in Colchester Essex | Student accommodation centre | 15 Gladstone Rd | Daily 00:00–23:30 |
| Fabulous Facades | Window installation service | The Seedbed Centre, Wyncolls Rd | Mon–Fri 08:00–18:00 |
| Farmhouse Fuels Ltd | Solid fuel company | Gatehouse Farm, Coggeshall Rd | Mon–Tue 09:00–16:00 |
| Fenn Wright Colchester Business Park | Commercial property estate agent | Business Park, 882 The Crescent | Mon–Fri 09:00–17:30 |
| Fetchapet Ltd | Pet moving service | 58 Malting Green Rd | Mon–Fri 08:00–16:00 |
| Fiat D Salmon Cars | Fiat dealer | Sheepen Rd | Mon–Fri 08:00–18:00 |
| First Strokes Swim School Ltd | Swimming school | 342 London Rd | Thu–Fri 09:30–20:15 |
| Fishnchickn Colchester, St Johns | Fish and chips takeaway | 54 St Christopher Rd | Mon–Sat 12:00–22:00 |
| Fiveways Fruit Farm | Farm | Warren Ln | Mon–Fri 08:30–17:30 |
| Flaming Gun Tattoo Studio | Tattoo and piercing shop | 16 Church Walk | Wed–Sat 09:45–17:00 |
| FLB Brickwork | Bricklayer | 33 Cowdray Ave | Mon 08:00–17:00 |
| Fluid Lines | Sporting goods shop | 13 Peartree Centre | Fri 09:30–17:30 |
| Fone World | Phone repair service | 16 Culver St W | Fri 09:00–18:00 |
| Fortune House | Chinese takeaway | 95 London Rd | Mon 17:00–22:00 |
| Found. | Antique furniture shop | Unit A, Fletchers Farm | Sat 09:00–13:00 |
| Fred's DIY | DIY store | 34 Kingsland Rd | Mon–Sat 08:30–17:30 |
| Freedom Wills Ltd | Estate planning lawyer | Fornham House, 227 London Rd | Daily 10:00–22:00 |
| Funkeefish - Vehicle Graphics, Wrap & PPF | Vehicle wrapping service | Unit 17, Hall Farm, Church Rd | Mon 08:30–17:00 |
| Future Air conditioning Ltd | Air conditioning contractor | Ardleigh Rd | Mon–Fri 08:00–18:00 |
| G B Farm Services Ltd | Farm equipment supplier | Unit 1, Frating Hall Farm, Church Rd | Fri 09:30–18:00 |
| G&M Plumbing & Heating | Plumbers' merchant | 3, 91 London Rd | Mon–Fri 07:30–17:00 |
| Games For Events | Equipment rental agency | 2 Glenway Cl | Fri 08:00–20:00 |
| Garden Games Hire UK | Event planning service | 6 Withrick Walk | Daily 08:00–20:00 |
| Gazebos Galore | Gazebo builder | Accounts Office, Mynott Court, Church Rd | Mon–Fri 08:30–16:30 |
| Gem Exterior Cleaning LTD | Pressure washing service | 5 Glisson Square | Daily Open 24 hours |
| GH Heating Services Ltd | Gas engineer | 22 Harwich Rd | Mon–Tue Open 24 hours |
| GHL Bakery Equipment Ltd | Bakery equipment | Rockinghams Farm | Mon–Fri 08:00–17:00 |
| Gift Box HeRo | Gift basket shop | 36 Maltings Rd | Daily Open 24 hours |
| Global Motorcycle Training | Motorcycle driving school | Rota House, Cowdray Ave | Tue–Sat 08:00–16:30 |