| Heol Don Care Home - Bupa | Nursing home | Heol Don | Daily Open 24 hours |
| Highfields Church | Evangelical church | Monthermer Rd | Mon–Fri 09:00–17:30 |
| Hobos Vintage | Tienda de ropa de segunda mano | 26 High Street Arcade | Mon–Sat 11:00–17:30 |
| House Buyers Wales | Property investment | House Buyers Wales, 126 Bute St | Daily Open 24 hours |
| Ibex Shuttle | Chauffeur service | Business Park, Unit 1 E Moors Rd | Daily 08:00–20:00 |
| Imaginatal - Ultrasound Clinic in Cardiff | Pregnancy care centre | 108 Caerphilly Rd | Daily 09:00–21:00 |
| Jai Thai Massage and Wellness Cardiff | Thai massage therapist | Suite6 & Suite7, 3rd floor, 10 Mill Ln | Mon 10:00–18:00 |
| Jantala Traditional Thai Massage | Massage therapist | 5A Penlline Rd | Mon–Fri 09:30–19:00 |
| JRC Global Buffet Cardiff | Buffet restaurant | Units 1 - 4, Stadium Plaza, Wood St | Mon–Thu 16:30–21:30 |
| JSM Management Group Ltd | Security service | Regus House, Suite G05 (Ground Floor) (C/O Agnitio, Malthouse Ave | Sun Open 24 hours |
| KJR Skin and Beauty | Facial spa | Rm 34, Global Link, Dunleavy Dr | Mon–Fri 09:00–22:00 |
| Laurel Bay Garden Services | Lawn care service | 17, Vincent Court, Vincent Rd | Mon–Fri 08:00–18:00 |
| Let Them See Cake | Brunch restaurant | 593 Cowbridge Rd E | Tue 10:00–16:00 |
| Let's Heat | HVAC contractor | Connies House, Rhymney River Bridge Rd | Daily Open 24 hours |
| Little Dessert Shop Cardiff | Dessert shop | 11-13 City Rd | Mon 16:00–00:00 |
| Little Kochi | South Indian restaurant | 78 Albany Rd | Tue–Thu 17:00–21:00 |
| Llandaff Heating | Plumber | 9 Victoria Ave | Daily Open 24 hours |
| Llanishen Leisure Centre | Leisure centre | Ty-Glas Ave | Mon–Thu 06:30–21:30 |
| Love Curry | Indian Takeaway | Indian takeaway | 452 Cowbridge Rd E | Tue–Sun 17:30–23:00 |
| Love Live Light Healing Hub | Health spa | 73 Pontcanna St | Mon 09:00–15:00 |
| Lyalena Lounge | Shisha bar | 119-121 City Rd | Daily 12:00–02:00 |
| Maindy Centre | Swimming pool | Crown Way | Mon–Thu 06:00–21:30 |
| Maison de Bœuf | French steak restaurant | 21 Castle Arcade | Tue–Thu 17:00–23:00 |
| Mayfair Massage Suite (Abigails/Villajoy) | Massage parlor | 112 Woodville Rd | Daily Open 24 hours |
| Meanwhile Cardiff | Business centre | Williams Way, Curran Embankment | Daily 06:00–00:00 |
| Milkwood | Restaurante galés | 83 Pontcanna St | Daily 08:30–16:00 |
| Mina Kiaroodi- Mortgage Adviser | Mortgage broker | Nicholson Webb Cl | Daily Open 24 hours |
| Mina Lebanese Cuisine | Lebanese restaurant | 43 Crwys Rd | Daily 17:00–22:00 |
| Morgan Clark Ltd | Loss adjuster | Neptune Court, Vanguard Way | Mon Open 24 hours |
| Mowgli's Indian Restaurant | Indian restaurant | 13 Penlline Rd | Mon–Thu 18:00–23:30 |