| 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 |
| Lost Land of the Volcano | — | documentary film | 1 | 3 |
| Lost Treasures of Egypt | National Geographic | documentary film | 6 | 48 |
| Lost Worlds, Vanished Lives | BBC Two | nature documentary | 1 | 4 |
| Louie Spence's Showbusiness | — | — | 1 | 10 |
| Louis Theroux Interviews | — | documentary television program | — | — |
| Louis Theroux's BBC Two specials | — | documentary film | — | — |
| Louis Theroux's Weird Weekends | BBC Two | documentary television program | 3 | 17 |
| Louis Theroux: Altered States | — | documentary television program | — | — |
| Love and Marriage | — | comedy drama | — | — |
| Love at First Sight | Sky One | — | — | — |
| Love for Lydia | ITV | — | — | 13 |
| Love Hurts | BBC One | drama television series, comedy television series | 3 | 30 |
| Love in a Cold Climate | — | — | — | 8 |
| Love Island | ITV | reality television | 2 | 5 |
| Love Life | — | drama television series | — | — |
| Love Monster | CBeebies | — | — | — |
| Love on a Saturday Night | ITV | — | 2 | 10 |
| Love Rat | Channel 5 | drama television series | — | — |
| Love Shaft | — | reality television | — | — |
| Love Soup | BBC One | comedy drama, romance television series | 2 | 18 |
| Love Story | — | — | — | — |
| Love Thy Neighbour | ITV | sitcom | 7 | 54 |
| Love Thy Neighbour | — | reality television | — | — |
| Love Your Garden | ITV | — | 6 | 35 |
| Lovejoy | BBC One | drama television series, comedy drama, mystery television series | 6 | 71 |
| Lovely Little Farm | — | — | — | — |
| Lovesick | Channel 4 | romantic comedy | 3 | 22 |
| LRTV | — | — | — | — |
| Lucky Feller | — | sitcom | 1 | 13 |
| Lucky Ladders | ITV | game show | 6 | 185 |
| Lucky Numbers | ITV | game show | 3 | 50 |
| Lucy Sullivan Is Getting Married | ITV | — | — | 16 |
| Ludwig | BBC One | — | 2 | 12 |
| Luna | ITV | science fiction television series, comedy television series, children's television series | 2 | 12 |
| Lunch Monkeys | BBC Three | sitcom | 2 | 12 |
| Lunchtime with Wogan | — | — | — | — |
| Luther | BBC One | police procedural, drama television series | 5 | 20 |
| Luv | BBC One | sitcom | 2 | 18 |
| LWT News | — | — | — | — |
| Lynley | BBC One, BBC NL, Eesti Televisioon, Das Erste | drama television series, crime television series, mystery television series | — | — |
| Lytton's Diary | — | — | 2 | 12 |
| M.I. High | BBC One | crime television series, action television series, espionage television series, children's television series | 8 | 88 |
| Mad About Alice | BBC One | sitcom | 1 | 6 |
| Mad Dogs | Sky One | black comedy, psychological thriller | 4 | 14 |
| Mad for It | CITV | — | 2 | 39 |
| Mad Mad World | — | panel game | 1 | 7 |
| Madabout | ITV | — | 2 | 26 |