| Leap in the Dark | — | anthology series | — | — |
| Learn With Sooty | — | — | — | — |
| Leave It to Todhunter | — | — | — | — |
| Leave Us Kids Alone | — | reality television | — | — |
| Leaving | — | — | — | — |
| Lee and Dean | — | — | — | — |
| Lee Mack's All Star Cast | BBC One | comedy television series | 1 | 6 |
| Lee Nelson's Well Funny People | BBC Three | comedy television series | 1 | 7 |
| Lee Nelson's Well Good Show | BBC Three | comedy television series | 2 | 15 |
| Lefties | — | documentary film | — | — |
| Legends | Netflix | crime thriller film | — | — |
| Legends of the Deep: Deep Sea Sharks | — | — | — | — |
| Lego Masters | Channel 4 | reality television | — | — |
| Lemon la Vida Loca | ITV2 | — | 2 | 12 |
| Lemur Street | Animal Planet | documentary television program | 1 | 20 |
| Len and the River Mob | — | — | — | — |
| Lena | British Broadcasting Corporation | variety show | 3 | 18 |
| Lena and Bonnie | — | — | — | — |
| Lena Zavaroni and Music | — | — | 1 | 6 |
| Lenny Blue | — | — | 2 | 4 |
| Lenny Henry in Pieces | British Broadcasting Corporation | comedy television series | 2 | 15 |
| Leonardo | Rai 1 | historical play, period drama film | 1 | 8 |
| Leonardo | BBC Children's and Education | drama television series | 2 | 26 |
| Les Dennis's Home Video Heroes | — | — | 2 | 60 |
| Let It Shine | BBC One | reality television | 1 | 3 |
| Let Me Entertain You | — | — | 1 | 6 |
| Let Me Entertain You | BBC Two | variety show | 2 | 40 |
| Let Them Eat Cake | BBC One | sitcom | 1 | 6 |
| Let There Be Love | — | sitcom | 2 | 12 |
| Let's Do Lunch with Gino & Mel | — | cooking show | 4 | 88 |
| Let's Get Gold | — | — | 1 | 3 |
| Let's Play | CBeebies | — | — | — |
| Let's Roll with Roland Butter | ITV | — | 1 | — |
| Let's Sing and Dance | — | talent show | — | — |
| Let's talk about Sex | Channel 4 | documentary film | 1 | 3 |
| Level Up | British Broadcasting Corporation | — | — | — |
| Lewis | ITV1 | crime television series, drama television series | 9 | 33 |
| Liaison | Apple TV | espionage television series, thriller | 1 | 6 |
| Liam's Story | CBBC | — | 1 | 10 |
| Liar | ITV | drama | 2 | 12 |
| Lie With Me | — | — | 1 | 2 |
| Life | BBC One | nature documentary | 1 | 10 |
| Life | BBC One | — | 1 | 6 |
| Life After Life | BBC Two | period drama film, science fiction | 1 | 4 |
| Life and Death Row | — | documentary television series | — | — |
| Life As I Know it | — | drama television series | — | — |
| Life Begins | ITV1 | drama television series | 3 | 19 |
| Life Begins at Forty | ITV | sitcom | 2 | 14 |
| Life Bites | Disney Channel | comedy television series | 2 | 28 |
| Life Drawing Live! | — | — | — | — |
| Life Force | — | — | — | — |
| Life in Cold Blood | British Broadcasting Corporation | nature documentary | 1 | 5 |
| Life in Colour with David Attenborough | BBC One, Nine Network | — | 1 | 3 |
| Life in Squares | — | LGBT-related television series | 1 | 3 |
| Life in the Air | BBC One | — | — | 3 |
| Life in the Freezer | BBC One | nature documentary | — | 6 |
| Life in the Snow | — | — | — | 1 |
| Life Is Toff | BBC Three | reality television | 1 | 6 |
| Life of Crime | ITV1 | crime television series, drama television series | 1 | 3 |
| Life of Riley | BBC One | sitcom | 3 | 20 |