| Kings of Comedy | Channel 4 | — | — | — |
| Kinsey | — | — | 2 | 12 |
| Kinvig | ITV | sitcom, science fiction television series | 1 | 7 |
| Kirsty's Home Videos | — | — | — | — |
| Kiss Me First | Channel 4 | drama television series, LGBT-related television series | 1 | 6 |
| Kiss of Death | BBC One | — | 1 | 1 |
| Kitchen Burnout | — | reality television | 1 | 7 |
| Kitchen Criminals | British Broadcasting Corporation | cooking show | 1 | 20 |
| Kizzy | — | — | — | — |
| Knife Edge: Chasing Michelin Stars | — | documentary television program | — | — |
| Knight School | ITV | — | 2 | 13 |
| Knightmare | CITV | fantasy television program, children's television series | 8 | 112 |
| Knights of God | Television South | fantasy television program, post-apocalyptic television series | 1 | 13 |
| Knock on Any Door | — | anthology series, drama television series | — | 20 |
| Knowing Me Knowing You with Alan Partridge | BBC Two | comedy television series | — | 7 |
| Kombat Opera Presents | — | comedy television series | 1 | 5 |
| KOOK | — | — | — | — |
| Kookyville | Channel 4 | — | 1 | 1 |
| Kröd Mändoon and the Flaming Sword of Fire | BBC Two | fantasy television series, comedy television series, LGBT-related television series | 1 | 6 |
| Kylie's Secret Night | Channel 4 | — | — | 1 |
| KYTV | BBC Two | comedy television series | 3 | 19 |
| L For Lester | — | — | — | — |
| L.A. 7 | BBC Children's and Education, BBC One | — | 1 | 13 |
| La Rebelle : Les Aventures de la jeune George Sand | — | — | — | — |
| Lab Rats | BBC Two | sitcom | 1 | 6 |
| Ladette to Lady | — | reality television | 5 | 27 |
| Ladhood | — | — | — | — |
| Ladies in Charge | — | — | — | — |
| Ladies of Letters | — | — | — | — |
| Lads' Army | ITV | reality television | 4 | 32 |
| Lady Killers | — | — | — | — |
| Lame Ducks | BBC Two | sitcom | 2 | 12 |
| Land Girls | BBC One | drama film | 3 | 15 |
| Land of Hope and Gloria | — | — | — | — |
| Land of Hope and Glory | British Broadcasting Corporation | — | — | 3 |
| Land of the Tiger | BBC Two | nature documentary | 1 | 6 |
| Landmark Sitcom Season | — | — | — | — |
| Landscapes of England | BBC Two | — | — | 12 |
| Landward | — | — | — | — |
| Lark Rise to Candleford | BBC One | drama television series | 4 | 40 |
| Last Chance Lottery | — | game show | — | — |
| Last Chance to See | BBC Two | — | 1 | 6 |
| Last Choir Standing | BBC One | reality television | 1 | 16 |
| Last Man Standing | BBC Three | reality television | 3 | 22 |
| Last of the Summer Wine | BBC One | sitcom | 31 | 295 |
| Last Tango in Halifax | BBC One | comedy drama, LGBT-related television series | 5 | 24 |
| Last Voices of World War 1 | — | documentary television program | — | — |
| Late Kick Off | BBC One | — | 5 | 64 |
| Late Night Horror | — | horror television series | — | 6 |
| Late Night Line-Up | — | — | — | — |
| Late Night Lycett | Channel 4 | talk show | — | — |
| Late Night Theatre | — | — | — | — |
| Late Starter | — | — | — | 8 |
| Later... with Jools Holland | BBC Two | music television | 51 | 295 |
| Laugh??? I Nearly Paid My Licence Fee | — | — | — | — |
| Law & Order: UK | ITV | police procedural, drama television series, legal drama | 8 | 53 |
| Lawless | — | thriller television series | — | 2 |
| Lazarus | Amazon Prime Video | thriller | — | — |
| Lazarus and Dingwall | — | — | — | — |
| Lead Balloon | BBC Four | sitcom | 4 | 27 |