| The Main Chance | ITV | legal drama | 4 | 45 |
| The Making of Me | BBC One | — | 1 | 3 |
| The Mallens | ITV | drama television series | 2 | 13 |
| The Mallorca Files | BBC One, British Broadcasting Corporation | drama | 2 | 16 |
| The Man from Interpol | — | — | 1 | 39 |
| The Man in Room 17 | — | drama television series, police procedural | — | — |
| The Man Who Finally Died | — | drama television series | — | — |
| The Man with 1000 Kids | Netflix | documentary television program | — | — |
| The Mark Steel Lectures | — | — | — | — |
| The Mark Thomas Comedy Product | Channel 4 | — | 6 | 45 |
| The Marlow Murder Club on Masterpiece | — | — | 1 | 4 |
| The Martian Chronicles | NBC | science fiction television series | — | 3 |
| The Martin Lewis Money Show | ITV | — | 6 | — |
| The Marty Feldman Comedy Machine | ITV | comedy television series | 1 | 14 |
| The Mary Whitehouse Experience | BBC Radio 1 | comedy television series | — | 13 |
| The Mash Report | — | — | — | 10 |
| The Mask of Janus | BBC One | — | 1 | 11 |
| The Masked Dancer | — | reality television | — | — |
| The Masked Singer | ITV1, ITV | entertainment television program | — | — |
| The Master Game | British Broadcasting Corporation | — | — | — |
| The Match | Sky One | reality television | — | — |
| The Match | — | — | — | — |
| The Matt Lucas Awards | BBC One | comedy television series | 2 | 16 |
| The Mavericks | — | documentary television program, miniseries | — | — |
| The Max Headroom Show | Channel 4 | — | 3 | 29 |
| The Mayfair Set | BBC Two | documentary film | — | 4 |
| The Melting Pot | — | — | — | — |
| The Men Who Killed Kennedy | ITV Central | documentary film, documentary television program | — | 9 |
| The Mersey Pirate | — | children's television series | — | — |
| The Message | BBC Three | comedy television series | 1 | 6 |
| The Met | — | documentary film | 2 | 5 |
| The Michael Ball Show | ITV | — | 1 | 30 |
| The Michael McIntyre Chat Show | BBC One | comedy television series | 1 | 7 |
| The Midnight Beast | E4 | sitcom | 2 | 12 |
| The Midwich Cuckoos | Q108084483 | drama television series, horror television series, science fiction television series | 1 | 7 |
| The Mighty Boosh | British Broadcasting Corporation | comedy television series | 3 | 21 |
| The Mighty Redcar | BBC Two | documentary | — | 4 |
| The Mill | Channel 4 | drama television series | 2 | 10 |
| The Million Pound Drop | Channel 4 | game show | — | — |
| The Million Pound Motors | — | — | — | — |
| The Mimic | Channel 4 | — | 2 | 11 |
| The Mind Beyond | — | anthology series, television serial | 1 | 6 |
| The Mind of Mr. J.G. Reeder | ITV | — | 2 | 16 |
| The Miniaturist | — | — | — | 2 |
| The Mint | ITV1 | game show | — | — |
| The Mint Extra | — | — | — | — |
| The Misadventures of Romesh Ranganathan | — | — | — | — |
| The Misfit | ITV | sitcom | 2 | 13 |
| The Missing | BBC One | drama television series | 2 | 16 |
| The Mistress | BBC Two | sitcom | 2 | 12 |
| The Mitchell and Webb Situation | Play UK | sketch comedy | 1 | 6 |
| The Moaning of Life | Sky One | documentary television program, comedy television series | 2 | 11 |
| The Mole | Channel 5 | reality television | 2 | 18 |
| The Mole – Undercover in North Korea | — | documentary film, documentary television program | — | 3 |
| The Molly Wopsies | — | — | — | — |
| The Moment of Proof | BBC One | — | — | — |
| The Moment of Truth | ITV | game show | 4 | 53 |
| The Monastery | BBC Two | documentary film, reality television | 1 | 4 |
| The Money Programme | BBC Two | — | — | — |
| The Moon Of The Prophets | — | documentary film | — | — |