| Love, Lies and Records | BBC One | LGBT-related television series | 1 | — |
| Loveland | — | game show | — | — |
| Mad Labs | National Geographic | documentary television program | — | 22 |
| Making the Most of the Micro | BBC Two | — | — | 10 |
| Making Your Mind Up | BBC One | — | — | — |
| Mammoth | — | — | — | — |
| Man's Work | — | — | — | — |
| Mandela: The Struggle Is My Life | — | — | — | — |
| Mann's Best Friends | — | — | — | — |
| Marc Wootton Exposed | — | comedy television program | — | 6 |
| Marjorie and Men | — | — | — | — |
| Mary Britten, M.D. | — | — | — | — |
| Mary Portas: Secret Shopper | Channel 4 | reality television | — | — |
| Mary Queen of Shops | BBC Two | documentary film, reality television | 3 | 16 |
| MasterChef | British Broadcasting Corporation | reality competition | — | — |
| Masterchef Turkey | Show TV | reality show | — | — |
| Masters and Servants | Channel 4 | — | — | — |
| Match of the Seventies | — | — | — | — |
| Matchpoint | — | game show | — | 32 |
| Maths-In-A-Box | — | — | 1 | 10 |
| Mathspy | — | — | 1 | 10 |
| Meet the Izzards | BBC One | — | — | — |
| Meet the Khans: Big in Bolton | — | — | — | — |
| Meet the Ukippers | BBC Two | — | — | 1 |
| Melissa | — | — | — | — |
| Men and Money | BBC Two | — | — | 6 |
| Men in Kilts: A Roadtrip with Sam and Graham | Starz | documentary television program | — | — |
| Mess Mates | — | — | — | — |
| Messiah | — | — | — | — |
| Micro Live | BBC Two | — | — | — |
| Mighty Moshin' Emo Rangers | MTV | — | 2 | 9 |
| Mike Brewer's World of Cars | Discovery Channel | reality television | — | — |
| Millie Inbetween: Access All Areas | BBC Children's and Education | — | — | — |
| Million 2 One | — | — | 1 | 10 |
| Mind, Body & Kick Ass Moves | BBC Three | documentary film | 1 | 10 |
| Misbehaving Mums To Be | — | — | — | 7 |
| Miss Naked Beauty | — | reality television | 1 | 6 |
| Mister Charlesworth | — | — | — | — |
| Mobil 1 The Grid | Channel 4 | — | 5 | 194 |
| Mondo Macabro | — | — | — | — |
| Mongrel Nation | — | — | — | — |
| Monkey Life | Channel 5 | — | 9 | 134 |
| Monster Moves | — | — | 6 | 31 |
| Monsters We Met | Animal Planet | documentary film | 1 | 3 |
| Moonlight on the Highway | ITV | — | — | — |
| More Than Robbery | — | — | — | — |
| Morning Call | Q1023911, CNBC | business, news program | — | — |
| Morning Live | BBC One | — | — | — |
| Most Evil Killers | — | — | — | — |
| Most Haunted: Midsummer Murders | — | — | 1 | 7 |
| Moviedrome | BBC Two | — | 13 | 207 |
| Moviewatch | Channel 4 | — | — | — |
| Mr. Pastry's Progress | — | — | — | — |
| MTV's Greatest Hits | — | — | — | — |
| MTV's Most Wanted | — | — | — | — |
| Mud Men | — | — | — | 30 |
| Murdaich | BBC Scotland | children's television | — | — |
| Murder Files | Channel 5 | — | 1 | 4 |
| Murdered by My Boyfriend | BBC Three | — | — | 1 |
| Muslim in Trump's America | — | — | — | — |