| 5 | Gulyas Garden | Mobile caterer | Welwyn Hatfield | AL10 |
| 5 | H R Owen | Restaurant/Cafe/Canteen | Welwyn Hatfield | AL10 9WN |
| 5 | H&H Food & Wine | Retailers - supermarkets/hypermarkets | St Albans City | AL1 3TA |
| 5 | H&H Fried Chicken & Kebabs | Takeaway/sandwich shop | St Albans City | AL1 3TA |
| 5 | H&H Pizza & Kebabs | Takeaway/sandwich shop | St Albans City | AL1 1PQ |
| 5 | HCL Catering @ Bernards Heath Infant & Nursery | School/college/university | St Albans City | AL1 4AP |
| 5 | HCL Catering @ Camp Primary and Nursery School | School/college/university | St Albans City | AL1 5PG |
| 5 | HCL Catering @ Cunningham Hill Infant School | School/college/university | St Albans City | AL1 5QJ |
| 5 | HCL Catering @ Cunningham Hill Junior School | School/college/university | St Albans City | AL1 5QJ |
| 5 | HCL Catering @ Maple Primary School | School/college/university | St Albans City | AL1 3SW |
| 5 | HCL Catering @ St Adrian's Catholic Primary School | School/college/university | St Albans City | AL1 2PB |
| 5 | HCL Catering @ St Peter's School & Nursery | School/college/university | St Albans City | AL1 1HL |
| 5 | HCL Catering @ The Abbey CofE Primary School | School/college/university | St Albans City | AL1 1DQ |
| 5 | HCL Catering @ Watling View School | School/college/university | St Albans City | AL1 2NU |
| 5 | HCL Catering @ Windermere Primary School | School/college/university | St Albans City | AL1 5QP |
| 5 | Haji Baba Ltd | Retailers - other | Welwyn Hatfield | AL10 0JW |
| Exempt | Halfords | Retailers - other | St Albans City | AL1 2RJ |
| Awaiting | Happy Helen - Healthy Eating | Other catering premises | St Albans City | AL1 |
| 5 | Happy Tokyo | Retailers - other | St Albans City | AL1 4SU |
| 4 | Happy Valley | Takeaway/sandwich shop | Welwyn Hatfield | AL10 8HZ |
| 5 | Harry's Takeaway | Takeaway/sandwich shop | St Albans City | AL1 1NG |
| 4 | Hatfield Best Kebab | Takeaway/sandwich shop | Welwyn Hatfield | AL10 0LD |
| 5 | Hatfield Central Travelodge | Hotel/bed & breakfast/guest house | Welwyn Hatfield | AL10 0XR |
| Exempt | Hatfield Foodbank | Importers/Exporters | Welwyn Hatfield | AL10 8HX |
| 5 | Hatfield Kebab and Pizza House | Takeaway/sandwich shop | Welwyn Hatfield | AL10 0LU |
| 5 | Hatfield Lawn Tennis and Bowling Club | Restaurant/Cafe/Canteen | Welwyn Hatfield | AL10 9PJ |
| 5 | Hatfield Manor Care Home | Hospitals/Childcare/Caring Premises | Welwyn Hatfield | AL10 9UA |
| 5 | Hatfield Nursing Home | Hospitals/Childcare/Caring Premises | Welwyn Hatfield | AL10 9EZ |
| 5 | Hatfield Road Methodist Church | Other catering premises | St Albans City | AL1 4JX |
| 5 | Hatfield Road Sports & Social Club | Pub/bar/nightclub | St Albans City | AL1 4JL |
| 5 | Hatfield Tap | Pub/bar/nightclub | Welwyn Hatfield | AL10 9BZ |
| Awaiting | Havana Dance Club | Pub/bar/nightclub | St Albans City | AL1 3HZ |
| 3 | Hazel Wine Stores | Retailers - other | Welwyn Hatfield | AL10 0EY |
| Awaiting | Heaven's Homemade Food | Other catering premises | St Albans City | AL1 |
| 3 | HenKinz | Takeaway/sandwich shop | St Albans City | AL1 1PQ |
| 5 | Here Japan Restaurant | Restaurant/Cafe/Canteen | Welwyn Hatfield | AL10 0LN |
| 5 | Hertfordshire Catering Ltd | School/college/university | Welwyn Hatfield | AL10 0PS |
| 5 | Hertfordshire Honey | Retailers - other | St Albans City | AL1 |
| Exempt | Hertfordshire Overnight Ltd t/a Home Counties | Distributors/Transporters | St Albans City | AL1 5UG |
| 4 | High View Cafe | Restaurant/Cafe/Canteen | Welwyn Hatfield | AL10 8HZ |
| Exempt | Holland & Barrett | Retailers - other | Welwyn Hatfield | AL10 0YB |
| 5 | Holland and Barrett | Retailers - other | St Albans City | AL1 3DH |
| 5 | Home Baking | Other catering premises | Welwyn Hatfield | AL10 |
| 3 | Hong Kong Inn | Takeaway/sandwich shop | St Albans City | AL1 1PQ |
| 4 | Honister | Hospitals/Childcare/Caring Premises | Welwyn Hatfield | AL10 9RW |
| 5 | Hotel Chocolat | Retailers - other | St Albans City | AL1 3YD |
| 5 | Howe Dell Manor | Hospitals/Childcare/Caring Premises | Welwyn Hatfield | AL10 8AE |
| 5 | Howe Dell Primary School | School/college/university | Welwyn Hatfield | AL10 9AH |
| 4 | Hungry Wolf | Mobile caterer | Welwyn Hatfield | AL10 |
| Awaiting | Husse Hertfordshire | Other catering premises | Welwyn Hatfield | AL10 |