| In the Grid | Channel 5 | game show | 1 | 70 |
| In the Long Run | — | — | — | — |
| In the Looking Glass | BBC Two | comedy television series | — | 6 |
| In the Night Garden | CBeebies, Discovery Family | children's television series | 2 | 20 |
| In the Red | BBC Two | — | 1 | 3 |
| In Therapy | Channel 5 | — | 3 | — |
| In with the Flynns | BBC One | sitcom | 2 | 12 |
| Incognito | BBC One | — | — | — |
| India with Sanjeev Bhaskar | BBC Two | documentary film | 1 | 4 |
| India: Nature's Wonderland | — | — | — | — |
| Indian Matchmaking | Netflix | documentary | 1 | 8 |
| Indian School | — | documentary film | — | 10 |
| Indian Summer School | Channel 4 | documentary | — | — |
| Indian Summers | Channel 4 | drama television series | 2 | 20 |
| Industrial Junkie | — | — | 1 | 10 |
| Industrial Revelations | Discovery Channel | documentary television program | 5 | 46 |
| Industry | HBO, BBC Two | drama television series | 4 | 32 |
| Infamous Assassinations | British Broadcasting Corporation | documentary television program | 1 | 20 |
| Informer | BBC One, British Broadcasting Corporation | crime film, thriller film | 1 | 6 |
| Ingenious Animals | — | — | 1 | 4 |
| Inheritance | ITV | — | 1 | 10 |
| Injustice | ITV | drama television series | 1 | 5 |
| Innocents | — | — | — | — |
| Insert Name Here | BBC Two | panel game | 2 | 6 |
| Inside Claridge's | — | documentary film | 1 | 3 |
| Inside Europe: Ten Years of Turmoil | — | documentary | — | — |
| Inside Gatwick | — | documentary television program | 1 | 8 |
| Inside George Webley | — | — | — | — |
| Inside KFC | BBC One | — | 1 | 3 |
| Inside Life | CBBC | — | — | 10 |
| Inside Men | BBC One | crime television series | 1 | 4 |
| Inside Nature's Giants | — | documentary television program | 4 | 18 |
| Inside No. 9 | BBC Two | comedy drama, anthology series, comedy television series | 8 | 49 |
| Inside Our Minds | — | — | — | — |
| Inside Out | BBC One | documentary film | — | — |
| Inside Out | — | children's television series | — | — |
| Inside Sport | BBC One | — | 4 | — |
| Inside the Crown: Secrets of the Royals | ITV | — | 1 | 4 |
| Inside the Factory | BBC Two | — | 9 | 70 |
| Inside the Freemasons | — | documentary television program | — | — |
| Inside the Gangsters Code | Discovery Channel | crime film | 1 | 5 |
| Inside the Mind of a Serial Killer | — | — | — | — |
| Inside the Tower of London | — | documentary television program | 7 | — |
| Inside the World's Toughest Prisons | Channel 5, MediaCorp Channel 5 | documentary television program | 5 | 16 |
| Inside Victor Lewis-Smith | BBC Two | — | 1 | 6 |
| Insides Out | — | children's television series, game show | 2 | — |
| Insomnia | Paramount+ | — | — | 6 |
| Inspector George Gently | BBC One, British Broadcasting Corporation | drama television series, crime television series | 8 | 25 |
| Inspector Morse | ITV | detective fiction, drama television series, crime television series | 12 | 33 |
| Intelligence | Sky One, Peacock | sitcom | 2 | 12 |
| Interceptor | ITV | — | 1 | 8 |
| Intergalactic | Sky One | science fiction television series, dystopian television series | 1 | 8 |
| Intergalactic Kitchen | BBC One | — | — | — |
| Interior Design Masters | BBC Two | reality television | — | — |
| International Detective | ITV | — | 1 | 39 |
| International King of Sports | Channel 5 | — | — | — |
| Interpol Calling | ITV | crime television series, police television drama | 1 | 39 |
| Intertel | — | — | — | — |
| Intikhab-e-Sukhan | MTA International | — | — | — |
| Intimate Strangers | — | — | — | — |