| Argumental | U&Dave | panel game | 4 | 49 |
| Ariel Mothers | — | — | 1 | 104 |
| Aristocrats | BBC One | drama television series | 1 | 6 |
| Armchair 30 | — | anthology series | — | 10 |
| Armchair Cinema | — | — | — | — |
| Armchair Detectives | BBC One | — | — | 20 |
| Armchair Mystery Theatre | — | — | — | — |
| Armchair Theatre | ITV | anthology series | — | 451 |
| Armchair Thriller | ITV | anthology series, drama television series | 2 | 54 |
| Armorsaurs | Disney XD | — | — | — |
| Armstrong and Miller | Q1114052 | — | 4 | 27 |
| Around the World in 20 Years | — | documentary film | — | 1 |
| Around the World in 80 Days | BBC One | documentary film, reality television | 1 | 6 |
| Around the World in 80 Days with Michael Palin | British Broadcasting Corporation | documentary television program | 1 | 7 |
| Around the World in 80 Faiths | BBC Two | documentary film | — | — |
| Around the World in 80 Gardens | BBC Two | documentary film | — | 10 |
| Around the World with Orson Welles | — | drama television series, documentary film | — | — |
| Arrange Me a Marriage | — | reality television | — | — |
| Art Attack | CITV, Disney Channel | children's television series | — | 291 |
| Art of Persia | — | — | — | — |
| Arthur & George | ITV | — | 1 | 3 |
| Arthur C. Clarke's Mysterious Universe | — | — | 1 | 26 |
| Arthur C. Clarke's Mysterious World | — | documentary film | — | — |
| Arthur C. Clarke's World of Strange Powers | — | documentary film | — | 13 |
| Arthur of the Britons | ITV | drama television series | 2 | 24 |
| Arthur's Treasured Volumes | ITV | sitcom | — | 6 |
| As Good Cooks Go | British Broadcasting Corporation | sitcom | — | 6 |
| As I Was Saying | — | — | — | — |
| As If | Channel 4 | drama television series, LGBT-related television series | 4 | 76 |
| As Seen on TV | BBC One | panel game | 1 | 8 |
| As the Bell Rings | Disney Channel | sitcom | 2 | 52 |
| As Time Goes By | BBC One | sitcom | 9 | 65 |
| ASBO Teen to Beauty Queen | — | reality television | — | 6 |
| Ashenden | British Broadcasting Corporation | drama television series, espionage television series, miniseries | — | 4 |
| Ashes to Ashes | BBC One | police procedural, science fiction television series, drama television series | 3 | 24 |
| Ashley Banjo's Secret Street Crew | — | — | 3 | 21 |
| Asia | BBC One | — | — | 7 |
| Asian Provocateur | BBC Three | travel documentary, comedy television series | 2 | 12 |
| Ask Aspel | — | — | — | — |
| Ask Pickles | — | — | — | — |
| Ask Rhod Gilbert | BBC One | panel game, comedy television series | 2 | 16 |
| Ask the Family | BBC One | game show | 17 | 270 |
| Assaulted Nuts | Channel 4 | comedy television series | 1 | 7 |
| Assignment Foreign Legion | — | — | 1 | 26 |
| Astronauts | ITV | sitcom, science fiction television series | 2 | 13 |
| Asylum | Q1114052 | sitcom | 1 | 6 |
| Asylum | BBC Four | — | 1 | 3 |
| At Home with the Braithwaites | ITV | comedy drama, drama television series | 4 | 26 |
| At Home With The Eubanks | Channel 5 | reality television | — | — |
| At Home with the Furys | — | — | — | 9 |
| At Last the 1948 Show | ITV | comedy television series | 2 | 13 |
| Atlantic: The Wildest Ocean on Earth | BBC Two | — | — | 3 |
| Atlantis | BBC One | fantasy television series, drama television series | 2 | 26 |
| Atletico Partick | British Broadcasting Corporation | sitcom | — | 7 |
| Atomic | Sky Atlantic | action film, drama fiction | 1 | 5 |
| Attachments | BBC Two | comedy drama | 2 | 26 |
| Attenborough and the Giant Egg | — | nature documentary | — | — |
| Attenborough in Paradise and Other Personal Voyages | — | nature documentary | — | — |
| Attenborough: 60 Years in the Wild | — | documentary film | 1 | 3 |
| Attention Scum | BBC Two | comedy television series | — | 6 |