| Liverpool 1 | — | — | 2 | 12 |
| Living and Growing | — | — | — | — |
| Living Britain | BBC Two | nature documentary | 1 | 6 |
| Living in the Past | — | documentary film, reality television | — | 12 |
| Living It Up | ITV | sitcom | 2 | 9 |
| Living on the Edge | MTV | reality television | 2 | 18 |
| Living on the Veg | — | — | — | — |
| Living the Life | — | — | 3 | 27 |
| Living with Modernism | — | documentary film | — | — |
| Living with the Dead | — | — | — | — |
| Living with the Future | — | documentary film | — | — |
| Liza & Huey's Pet Nation | — | — | 1 | 11 |
| Lizzie Dripping | BBC One | — | — | 9 |
| Loaded | Channel 4 | — | 1 | 8 |
| Loaded Fight Night | — | — | — | — |
| Local Food Hero | — | cooking show | 3 | — |
| Local Heroes | — | documentary film | — | — |
| Location, Location, Location | Channel 4 | reality television | — | — |
| Lockerbie: A Search for Truth | Sky Atlantic, Peacock | biographical film | — | 5 |
| Lockwood & Co | Netflix | paranormal television program, detective television series, action television series, fantasy television series, horror television series, thriller television series, teen television series, mystery television series | 1 | 8 |
| LOL: Last One Laughing UK | Amazon Prime Video | game show | 1 | 6 |
| London | British Broadcasting Corporation | documentary film | 1 | 3 |
| London Bridge | ITV | soap opera | 4 | 237 |
| London Ink | Real Time | reality television | 2 | 12 |
| London Irish | Channel 4 | sitcom | 1 | 6 |
| London Kills | — | — | 4 | 20 |
| London Live | Rai 2 | — | — | — |
| London Playhouse | — | — | — | — |
| London Spy | BBC Two | drama television series | 1 | 5 |
| London's Burning | ITV | drama television series | 14 | 171 |
| London's Burning | — | — | — | — |
| Long Lost Family | ITV1 | documentary television program | — | 49 |
| Long Shadow | BBC Two | documentary television program | — | — |
| Long Way Down | BBC Two | travel documentary | — | 6 |
| Long Way Home | Apple TV | travel documentary | — | 10 |
| Long Way Round | Sky One | travel documentary | 1 | 7 |
| Long Way Up | Apple TV | travel documentary | — | 11 |
| Longitude | Channel 4 | drama television series | — | 4 |
| Look and Read | BBC One | children's television series | — | — |
| Look Around You | BBC Two | comedy television series | 2 | 15 |
| Lookaround | — | — | — | — |
| Looking After Jo Jo | — | — | 1 | 4 |
| Looking For Clancy | — | — | — | 5 |
| Loose Lips | — | — | 1 | 44 |
| Loose Talk | — | — | — | — |
| Loose Women | ITV | talk show | 24 | — |
| Lord of the Flies | BBC iPlayer, BBC One | adventure fiction, drama fiction, thriller | — | 4 |
| Lord Peter Wimsey | British Broadcasting Corporation | — | — | — |
| Lord Raingo | — | — | — | — |
| Lorna Doone | — | — | — | — |
| Lorraine | ITV | LGBT-related television series, breakfast television | — | — |
| Los Dos Bros | Channel 4 | sitcom | 1 | 6 |
| Lose A Million | ITV | game show | 1 | — |
| Lost Animals of the 20th Century | Channel 4 | — | 1 | 68 |
| Lost Boys & Fairies | BBC One | drama film, LGBT-related television series | — | 3 |
| Lost Empires | — | drama television series | — | — |
| Lost in Austen | ITV | romance television series | 1 | 4 |
| Lost Kingdoms of Africa | BBC Four | documentary film | 2 | 8 |
| Lost Land of the Jaguar | BBC One | nature documentary | — | 3 |
| Lost Land of the Tiger | BBC One | nature documentary | — | 3 |