| 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 |
| Interpol Calling | ITV | crime television series, police television drama | 1 | 39 |
| Intertel | — | — | — | — |
| Intimate Strangers | — | — | — | — |
| Into the Fire | — | thriller television series | — | 3 |
| Into the Labyrinth | ITV | science fiction television series | 3 | 21 |
| Intruder | Channel 5 | — | — | 4 |
| Invasion | BBC Two | documentary film | 1 | 3 |
| Invasion of the Job Snatchers | — | — | 1 | 6 |
| Invasion: Earth | — | science fiction television series | 1 | 6 |
| Inventions That Changed the World | BBC Two | documentary film | — | 5 |
| Iron Chef UK | Channel 4 | cooking show | 1 | 25 |
| Is Born series | — | — | — | — |
| Is It Bill Bailey? | BBC Two | comedy television series | 1 | 6 |
| Is It Legal? | ITV | sitcom | 3 | 21 |
| Ishq Ki Inteha | — | — | — | 26 |
| Island at War | ITV | drama television series | — | — |
| Island Medics | — | — | — | — |
| Island of the Sea Wolves | — | documentary film | 1 | 3 |
| Islands of Britain | ITV | documentary television program | 1 | 3 |
| Isolation Stories | — | — | — | — |
| Issi Noho | — | children's television series | — | — |
| It Ain't Half Hot Mum | BBC One, British Broadcasting Corporation | sitcom | 8 | 56 |
| It Gets Worse | Channel 4, Crave | comedy, sitcom | 1 | 6 |
| It Takes a Worried Man | — | sitcom | 3 | 19 |
| It'll be Alright on the Night | ITV1 | — | — | 42 |
| It's a Knockout | BBC One | game show | 17 | 272 |
| It's a Mystery | ITV | — | 5 | 44 |
| It's a Sin | Channel 4 | drama fiction, LGBT-related television series | 1 | 5 |
| It's a Square World | — | comedy television series | — | — |
| It's All About Amy | Channel 5 | reality television | 1 | 8 |
| It's Awfully Bad For Your Eyes, Darling | — | sitcom | — | — |
| It's Kevin | BBC Two | comedy television series | — | 6 |
| It's Not Easy Being Green | British Broadcasting Corporation | — | — | — |
| It's Not Just Saturday | Scottish Television | magazine format program | — | — |
| It's Not Me, It's You | Channel 5 | panel game | 1 | 8 |
| It's Not Rocket Science | ITV | — | 1 | 6 |
| It's Not What You Know | — | game show | 1 | 30 |
| It's Now or Never | — | game show | 1 | 2 |
| It's Only a Theory | BBC Four | panel game | 1 | 8 |
| It's Only TV...but I Like It | BBC One | game show | 4 | 32 |
| ITV Evening News | ITV1 | — | — | — |
| ITV Lunchtime News | ITV1 | — | — | — |
| ITV News | — | — | — | — |
| ITV News Anglia | ITV Anglia | — | — | — |
| ITV News at 10.30 | ITV | news | — | — |
| ITV News at 5:30 | ITV1 | — | — | — |
| ITV News at Ten | ITV1 | current affairs, news | — | — |
| ITV News Central | ITV1 | — | — | — |
| ITV News Tyne Tees | ITV Tyne Tees | — | — | — |