| 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 Stallion | BBC One | adventure television series, children's television series | — | 6 |
| The Morecambe & Wise Show | BBC Two | comedy television series | 13 | 105 |
| The Morecambe & Wise Show | — | — | — | — |
| The Morgana Show | Channel 4 | — | 1 | — |
| The Morph Files | — | children's television series | 1 | 13 |
| The Movie Chart Show | — | — | — | — |
| The Movie Game | BBC One | — | 8 | — |
| The Movie Show on ITV2 | ITV2 | — | 1 | 13 |
| The Mrs Bradley Mysteries | BBC One | drama television series | 1 | 5 |
| The Munch Box | CITV | — | 2 | 24 |
| The Muppet Show | ITV, France Régions 3, RTVE, Disney+ | comedy television series, puppetry, sketch comedy, variety show | 5 | 120 |
| The Murder Game | BBC One | reality television | 1 | 9 |
| The Music Box | — | — | — | — |
| The Musketeers | BBC One, BBC America | drama television series, swashbuckler film | 3 | 30 |
| The Mystery of Edwin Drood | BBC Two | drama television series | — | — |
| The Mysti Show | British Broadcasting Corporation | children's television series | — | — |
| The Naked Chef | BBC Two | cooking show | 3 | 25 |
| The Naked Choir | BBC Two | — | 1 | 6 |
| The Nation's Favourite | ITV1 | documentary film | — | 16 |
| The National Lottery: In It to Win It | BBC One | game show | 18 | 172 |
| The National Trust | — | documentary film | — | — |
| The Nativity | — | Christmas television series | — | 4 |
| The Nature of Britain | — | documentary film | — | — |
| The Nearly Man | ITV | — | 1 | 8 |
| The Nesbitts Are Coming | — | — | — | — |
| The Net | — | documentary film | — | — |
| The New Adventures of Black Beauty | ITV | drama television series | — | — |
| The New Avengers | ITV | espionage television series | 2 | 26 |
| The New Statesman | ITV, BBC One | sitcom | 4 | 26 |
| The New Statesman | — | — | — | — |
| The New Worst Witch | ITV | fantasy television series | 2 | 26 |
| The Newcomers | BBC One | soap opera, drama television series | — | 430 |
| The Night Caller | — | — | — | — |
| The Night Manager | AMC, BBC One | drama television series, crime television series, espionage television series | 2 | 12 |
| The Nightly Show | ITV | — | 1 | 39 |
| The Nightmare Neighbour Next Door | Channel 5 | documentary television program | 4 | 20 |
| The No. 1 Ladies' Detective Agency | BBC One | detective television series | 1 | 7 |
| The Noise | ITV | — | 1 | 17 |
| The Nokia Green Room | — | Christmas film | — | — |
| The Normans | BBC Two | documentary film, documentary television program | 1 | 3 |
| The North Water | BBC Two | — | 1 | 5 |
| The Numtums | CBeebies | — | 3 | 77 |
| The Office | BBC Two, BBC One | sitcom, mockumentary, pseudo-documentary | 2 | 14 |
| The Old Boy Network | ITV1 | — | 1 | 7 |
| The Old Curiosity Shop | — | drama television series | 1 | 9 |
| The Old Grey Whistle Test | BBC Two | music television | — | — |
| The Old Guys | BBC One | sitcom | 2 | 12 |
| The Omega Factor | BBC One | science fiction television series, drama television series, thriller television series, horror television series | — | 10 |
| The Omid Djalili Show | BBC One | comedy television series | 2 | 12 |
| The One | Netflix | science fiction television series, drama television series, thriller television series | 1 | 8 |
| The One and Only | BBC One | reality television | 1 | 6 |
| The One Show | BBC One | documentary film | — | — |
| The One... | — | comedy television series | — | — |
| The Onedin Line | BBC One | drama television series | 8 | 91 |
| The Only Way Is Essex | ITV2 | reality television | 32 | 395 |
| The Optimist | Channel 4 | — | 2 | 13 |