| Kevin McCloud's Escape to the Wild | Channel 4 | — | 1 | 4 |
| Kevin McCloud's Man Made Home | Channel 4 | documentary television program | — | 8 |
| Keynotes | ITV | game show | 5 | 205 |
| Kick Start | BBC One | — | 13 | 35 |
| Kidnap and Ransom | ITV | — | 2 | 6 |
| Kidnapped: The Chloe Ayling Story | — | — | — | 6 |
| Kids Say the Funniest Things | ITV | — | — | — |
| Kill Jackie | — | thriller | — | — |
| Killer | — | — | — | — |
| Killer Britain with Dermot Murnaghan | Crime & Investigation Network | — | 4 | 25 |
| Killer Camp | — | game show | — | — |
| Killer Couples | — | documentary television program | — | — |
| Killer Magic | BBC Three | game show | 1 | 7 |
| Killer Net | Channel 4 | thriller television series | 1 | 4 |
| Killer Ratings | Netflix | true crime | 1 | 7 |
| Killer Women with Piers Morgan | — | — | — | — |
| Killers Behind Bars: The Untold Story | — | documentary film, documentary television program | — | — |
| Killing Eve | BBC America | thriller television series, LGBT-related television series, drama film, black comedy | 4 | 32 |
| Kilroy | BBC One | talk show | — | — |
| Kim & Co | — | — | 2 | 26 |
| Kindly Leave the Kerb | — | — | — | — |
| King Alfred and the Anglo Saxons | — | documentary film | 1 | 3 |
| King and Castle | — | — | — | 12 |
| King Cinder | BBC One | — | 1 | 6 |
| King Gary | BBC One Wales | — | 2 | 13 |
| King of the Castle | ITV1 | — | 1 | 7 |
| King of the Ghetto | BBC Two | — | 1 | 4 |
| King of the Nerds | — | — | 1 | 8 |
| King of the River | BBC One | — | 1 | 17 |
| King Of... | Channel 4 | — | 1 | 4 |
| King Rollo | BBC One | — | 1 | 13 |
| King's Royal | — | — | — | — |
| Kingdom | ITV | drama television series, comedy television series | 3 | 18 |
| Kingdom | BBC One | nature documentary | — | — |
| Kingdom of Plants 3D | Sky 3D | documentary television program, nature documentary | 1 | 3 |
| 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 |
| 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 | — | — | — | — |