| Millie Inbetween | CBBC | — | 3 | 26 |
| Million Dollar Traders | BBC Two | reality television | 1 | 3 |
| Million Pound Property Experiment | — | — | — | — |
| Millionaires Mansions | — | — | — | — |
| Mind Your Language | ITV | sitcom | 4 | 42 |
| Minder | ITV | drama television series | 10 | 108 |
| Minipops | Channel 4 | — | 1 | 6 |
| Miracles Take Longer | — | — | 1 | 36 |
| Miranda | BBC Two | sitcom | 3 | 20 |
| Misfits | E4 | science fiction television series, drama television series, comedy drama, coming-of-age television program, raunchy comedy television program | 5 | 37 |
| Miss Austen | BBC One, PBS | period drama film, historical drama | 1 | 4 |
| Miss Jones and Son | ITV | sitcom | 2 | 12 |
| Miss Marie Lloyd: Queen of the Music Hall | — | — | — | — |
| Miss Marple | BBC One, British Broadcasting Corporation | detective television series | 1 | 12 |
| Miss Morison's Ghosts | — | — | — | — |
| Miss Scarlet | Alibi, PBS | crime television series, historical drama, mystery television series | 6 | 36 |
| Miss Spider's Sunny Patch Friends | Cartoon Network, Nickelodeon | children's television series | 3 | 65 |
| Missing | BBC One | factual television program | 8 | 24 |
| Missing | BBC One | crime film | 2 | 15 |
| Missing | — | — | 1 | 2 |
| Missing You | Netflix | thriller television series | 1 | 5 |
| Mission Africa | BBC One | reality television | 1 | 12 |
| Mission Selfie | — | — | — | — |
| Mission: 2110 | BBC Children's and Education | — | 2 | 26 |
| Mister Maker | CBeebies | children's television series | 3 | 60 |
| Mister Maker Around the World | CBeebies | — | — | — |
| Mister Maker Comes to Town | CBeebies | children's television series | 2 | 51 |
| Mistresses | BBC One | drama television series, LGBT-related television series | 3 | 16 |
| Mitchell and Webb Are Not Helping | Channel 4 | — | 1 | 6 |
| Mixed Bill | — | — | — | — |
| Mixed Blessings | ITV | sitcom | 3 | 22 |
| Mixmasters | — | — | — | — |
| Mobile | — | drama television series | 1 | 3 |
| Mock the Week | BBC Two, TLC | panel game, comedy television series | 15 | 181 |
| Model Behaviour | Channel 4 | reality television | 2 | — |
| Modern Times | — | — | — | — |
| Modern Toss | Channel 4 | — | 2 | 12 |
| Mog | ITV | sitcom | 2 | 13 |
| Mole Sisters | — | — | — | — |
| Moley | — | — | — | — |
| Moll Flanders | — | — | — | — |
| Molly and Mack | CBeebies | children's television series | — | — |
| Monarch of the Glen | BBC One | drama television series | 7 | 64 |
| Monarchy | Channel 4 | — | — | 17 |
| Monarchy: The Royal Family at Work | BBC One | documentary film | — | 5 |
| Monday Monday | — | drama television series | 1 | 7 |
| Money | — | — | — | — |
| Money For Nothing | BBC One | — | — | — |
| Money Pit | — | — | — | — |
| Moneybags | — | — | — | — |
| Moneyball | ITV | game show | 2 | 14 |
| Mongrels | BBC Three, British Broadcasting Corporation | sitcom | 2 | 17 |
| Monitor | — | documentary film | — | — |
| Monkey Business | — | — | — | — |
| Monkey Dust | BBC Three | satire, comedy television series | 3 | 18 |
| Monkey Magic | Channel 5 | — | 2 | 16 |
| Monkey Planet | — | nature documentary | 1 | 3 |
| Monkey Trousers | ITV1 | comedy television series | 1 | 5 |
| Monkman & Seagull's Genius Guide to Britain | BBC Two | — | 1 | 4 |
| Monkman & Seagull’s Genius Adventures | BBC Two | — | 1 | 4 |