| I Woke Up One Morning | — | — | — | — |
| I'd Do Anything | BBC One | reality television | 1 | 22 |
| I'll Get This | BBC Two | — | — | — |
| I'm a Celebrity... South Africa | — | — | — | — |
| I'm a Celebrity...Get Me Out of Here! | ITV | reality television | 16 | 182 |
| I'm a Celebrity: Extra Camp | — | — | 19 | — |
| I'm a Celebrity: Unpacked | — | — | — | — |
| I'm Alan Partridge | BBC Two | sitcom, comedy film | 2 | 12 |
| I'm Bob, He's Dickie | ATV | comedy | 1 | 6 |
| I'm Famous and Frightened! | — | reality television, game show | 4 | 12 |
| I'm Spazticus | — | — | — | — |
| I'm with Stupid | BBC Three | sitcom | 1 | 6 |
| I've Got Something To Tell You | W Network | — | 1 | 6 |
| I've Never Seen Star Wars | BBC Four | — | 1 | 9 |
| I, Jack Wright | UKTV | drama television series | — | — |
| I, Lovett | BBC Two | sitcom | 1 | 7 |
| Ian Hislop's Stiff Upper Lip – An Emotional History of Britain | BBC Two | — | 1 | 3 |
| Ibiza Uncovered | Sky One | — | 7 | 56 |
| Ibrahim Khan The Animated Series | — | — | — | — |
| Ice Age Giants | BBC Two | documentary film | 1 | 3 |
| Ice Road Rescue | National Geographic | docu-soap | 10 | 77 |
| Ice Warriors | ITV | game show | 1 | 9 |
| Iceland Foods: Life in the Freezer Cabinet | — | documentary film | 1 | 3 |
| Iconicles | CBeebies | — | — | — |
| Icons | — | — | — | — |
| Ideal | BBC Three | sitcom | 5 | 39 |
| Identity | — | police procedural, drama television series | 1 | 6 |
| If I Ruled the World | BBC Two | panel game | 2 | 14 |
| If You See God, Tell Him | BBC One | sitcom | 1 | 4 |
| If... | — | docudrama | — | — |
| Igam Ogam | Channel 5 | — | 2 | 52 |
| Ill Behaviour | BBC Two | comedy television program, thriller | 1 | 3 |
| Imagine | BBC One | documentary television program | 35 | 211 |
| Immortal Egypt | — | — | 1 | 4 |
| Impact | — | — | 1 | 2 |
| Impact | BBC News | — | — | — |
| Impossible | BBC One | game show | 8 | 225 |
| Impossible Engineering | — | — | — | — |
| Impractical Jokers UK | — | comedy television series | 3 | 21 |
| In a Land of Plenty | BBC Two | — | 1 | 10 |
| In and Out of the Kitchen | — | comedy television series | 1 | 3 |
| In Bed with Medinner | — | — | — | — |
| In Concert | British Broadcasting Corporation | — | 9 | 113 |
| In Confidence | — | — | 3 | — |
| In Deep | BBC One | — | 3 | 22 |
| In Defence | ITV | crime television series | 1 | 4 |
| In Denial of Murder | — | — | — | 2 |
| In Flight | Channel 4 | — | — | 6 |
| In for a Penny | ITV1 | panel game | 2 | 17 |
| In Loving Memory | ITV | sitcom | 5 | 37 |
| In My Skin | British Broadcasting Corporation | comedy television series, black comedy television series, drama television series | 2 | 10 |
| In Plain Sight | ITV | drama television series | 1 | 3 |
| In Search of the Dark Ages | — | — | 2 | 8 |
| In Search of the Trojan War | BBC Two | documentary television program | 1 | 6 |
| In Sickness and in Health | BBC One | sitcom | 6 | 47 |
| In Suspicious Circumstances | — | — | — | — |
| In the Club | BBC One | drama film | 2 | 8 |
| In the Dark | BBC One | crime film | 1 | 4 |
| In the Flesh | BBC Three | drama television series, fantasy television series, LGBT-related television series | 2 | 9 |
| In the Footsteps of Alexander the Great | — | documentary television program | 1 | 4 |