| I Am a Killer | Crime & Investigation Network | documentary television program | 2 | 20 |
| I Am Not an Animal | BBC Two | comedy television series | — | 6 |
| I Can Cook | CBeebies | cooking show | 4 | — |
| I Can Do That | NBC | game show | — | — |
| I Can See Your Voice | — | — | — | — |
| I Didn't Know That | National Geographic | documentary television program | 3 | 31 |
| I Dream | British Broadcasting Corporation | sitcom, children's television series | 1 | 13 |
| I Dreamed a Dream: The Susan Boyle Story | — | — | — | 1 |
| I Hate Suzie | Sky Atlantic | black comedy | 2 | 11 |
| I Hate You | — | — | — | — |
| I Kissed a Boy | BBC Three | dating game show | — | — |
| I Kissed a Girl | BBC Three | dating game show | — | — |
| I Literally Just Told You | Channel 4 | game show | 2 | 14 |
| I Live with Models | Comedy Central | sitcom | 2 | 16 |
| I Love My Country | BBC One | panel game, comedy television series | 1 | 8 |
| I Love the '70s | — | — | — | — |
| I Love the '80s | BBC Two | — | — | — |
| I Love the '90s | BBC Two | — | — | — |
| I Never Knew That About Britain | — | — | 1 | 8 |
| I Remember Nelson | — | — | — | — |
| I Survived a Zombie Apocalypse | BBC Three | — | 1 | 8 |
| I Want My Wife Back | BBC One | sitcom | 1 | 6 |
| I Was a Rat | — | — | 1 | 3 |
| 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 |
| In the Grid | Channel 5 | game show | 1 | 70 |
| In the Long Run | — | — | — | — |
| In the Looking Glass | BBC Two | comedy television series | — | 6 |
| In the Night Garden | CBeebies, Discovery Family | children's television series | 2 | 20 |
| In the Red | BBC Two | — | 1 | 3 |
| In Therapy | Channel 5 | — | 3 | — |
| In with the Flynns | BBC One | sitcom | 2 | 12 |
| Incognito | BBC One | — | — | — |
| India with Sanjeev Bhaskar | BBC Two | documentary film | 1 | 4 |
| India: Nature's Wonderland | — | — | — | — |
| Indian Matchmaking | Netflix | documentary | 1 | 8 |
| Indian School | — | documentary film | — | 10 |
| Indian Summer School | Channel 4 | documentary | — | — |
| Indian Summers | Channel 4 | drama television series | 2 | 20 |
| Industrial Junkie | — | — | 1 | 10 |
| Industrial Revelations | Discovery Channel | documentary television program | 5 | 46 |
| Industry | HBO, BBC Two | drama television series | 4 | 32 |
| Infamous Assassinations | British Broadcasting Corporation | documentary television program | 1 | 20 |
| Informer | BBC One, British Broadcasting Corporation | crime film, thriller film | 1 | 6 |
| Ingenious Animals | — | — | 1 | 4 |
| Inheritance | ITV | — | 1 | 10 |
| Injustice | ITV | drama television series | 1 | 5 |
| Innocents | — | — | — | — |
| Insert Name Here | BBC Two | panel game | 2 | 6 |
| Inside Claridge's | — | documentary film | 1 | 3 |
| Inside Europe: Ten Years of Turmoil | — | documentary | — | — |
| Inside Gatwick | — | documentary television program | 1 | 8 |
| Inside George Webley | — | — | — | — |
| Inside KFC | BBC One | — | 1 | 3 |
| Inside Life | CBBC | — | — | 10 |
| Inside Men | BBC One | crime television series | 1 | 4 |
| Inside Nature's Giants | — | documentary television program | 4 | 18 |
| Inside No. 9 | BBC Two | comedy drama, anthology series, comedy television series | 8 | 49 |
| Inside Our Minds | — | — | — | — |
| Inside Out | BBC One | documentary film | — | — |
| Inside Out | — | children's television series | — | — |
| Inside Sport | BBC One | — | 4 | — |
| Inside the Crown: Secrets of the Royals | ITV | — | 1 | 4 |
| Inside the Factory | BBC Two | — | 9 | 70 |
| Inside the Freemasons | — | documentary television program | — | — |
| Inside the Gangsters Code | Discovery Channel | crime film | 1 | 5 |
| Inside the Mind of a Serial Killer | — | — | — | — |
| Inside the Tower of London | — | documentary television program | 7 | — |
| Inside the World's Toughest Prisons | Channel 5, MediaCorp Channel 5 | documentary television program | 5 | 16 |
| Inside Victor Lewis-Smith | BBC Two | — | 1 | 6 |
| Insides Out | — | children's television series, game show | 2 | — |
| Insomnia | Paramount+ | — | — | 6 |
| Inspector George Gently | BBC One, British Broadcasting Corporation | drama television series, crime television series | 8 | 25 |
| Inspector Morse | ITV | detective fiction, drama television series, crime television series | 12 | 33 |
| Intelligence | Sky One, Peacock | sitcom | 2 | 12 |
| Interceptor | ITV | — | 1 | 8 |
| Intergalactic | Sky One | science fiction television series, dystopian television series | 1 | 8 |
| Intergalactic Kitchen | BBC One | — | — | — |
| Interior Design Masters | BBC Two | reality television | — | — |
| International Detective | ITV | — | 1 | 39 |
| International King of Sports | Channel 5 | — | — | — |
| Interpol Calling | ITV | crime television series, police television drama | 1 | 39 |
| Intertel | — | — | — | — |
| Intikhab-e-Sukhan | MTA International | — | — | — |
| Intimate Strangers | — | — | — | — |
| Into the Fire | — | thriller television series | — | 3 |
| Into the Labyrinth | ITV | science fiction television series | 3 | 21 |
| Introducing Tony Ferrino - Who? And Why? - A Quest | — | — | — | — |
| Intruder | Channel 5 | — | — | 4 |
| Invasion | BBC Two | documentary film | 1 | 3 |
| Invasion of the Job Snatchers | — | — | 1 | 6 |
| Invasion: Earth | — | science fiction television series | 1 | 6 |
| Inventions That Changed the World | BBC Two | documentary film | — | 5 |
| Irish Pickers | — | — | — | — |
| Iron Chef UK | Channel 4 | cooking show | 1 | 25 |
| Is Born series | — | — | — | — |
| Is It Bill Bailey? | BBC Two | comedy television series | 1 | 6 |
| Is It Legal? | ITV | sitcom | 3 | 21 |
| Ishq Ki Inteha | — | — | — | 26 |
| Island at War | ITV | drama television series | — | — |
| Island Medics | — | — | — | — |
| Island of the Sea Wolves | — | documentary film | 1 | 3 |
| Islands of Britain | ITV | documentary television program | 1 | 3 |
| Isolation Stories | — | — | — | — |
| Issi Noho | — | children's television series | — | — |
| It Ain't Half Hot Mum | BBC One, British Broadcasting Corporation | sitcom | 8 | 56 |
| It Gets Worse | Channel 4, Crave | comedy, sitcom | 1 | 6 |
| It Pays to Watch! | — | — | — | — |
| It Takes a Worried Man | — | sitcom | 3 | 19 |
| It'll be Alright on the Night | ITV1 | — | — | 42 |
| It'll Never Work | BBC One | — | 6 | 41 |
| It's a Knockout | BBC One | game show | 17 | 272 |
| It's a Mystery | ITV | — | 5 | 44 |
| It's a Sin | Channel 4 | drama fiction, LGBT-related television series | 1 | 5 |
| It's a Square World | — | comedy television series | — | — |
| It's All About Amy | Channel 5 | reality television | 1 | 8 |
| It's Awfully Bad For Your Eyes, Darling | — | sitcom | — | — |
| It's Kevin | BBC Two | comedy television series | — | 6 |
| It's Me or the Dog | Channel 4 | reality television | 4 | 38 |
| It's Not Easy Being Green | British Broadcasting Corporation | — | — | — |
| It's Not Just Saturday | Scottish Television | magazine format program | — | — |
| It's Not Me, It's You | Channel 5 | panel game | 1 | 8 |
| It's Not Rocket Science | ITV | — | 1 | 6 |
| It's Not What You Know | — | game show | 1 | 30 |
| It's Now or Never | — | game show | 1 | 2 |
| It's Only a Theory | BBC Four | panel game | 1 | 8 |
| It's Only TV...but I Like It | BBC One | game show | 4 | 32 |
| Italia 90: Four Weeks That Changed the World | — | — | 1 | 3 |
| ITN World News | NBC Europe, ITV, TVM, Nine Network, PBS | — | — | — |
| ITV at the Movies | — | — | 7 | 74 |
| ITV Evening News | ITV1 | — | — | — |
| ITV Food | ITV1 | cooking show | — | — |
| ITV Lunchtime News | ITV1 | — | — | — |
| ITV News | — | — | — | — |
| ITV News Anglia | ITV Anglia | — | — | — |
| ITV News at 10.30 | ITV | news | — | — |
| ITV News at 5:30 | ITV1 | — | — | — |
| ITV News at Ten | ITV1 | current affairs, news | — | — |
| ITV News Central | ITV1 | — | — | — |
| ITV News Tyne Tees | ITV Tyne Tees | — | — | — |
| ITV News West Country | — | — | — | — |
| ITV News: Wales at Six | — | — | — | — |
| ITV Nightly News | ITV | — | — | — |
| ITV Nightscreen | ITV1 | — | — | — |
| ITV Panto | — | — | — | — |
| ITV Play of the Week | ITV | anthology series, drama television series, television play | — | — |
| ITV Playhouse | — | drama television series | — | — |
| ITV Racing | ITV | — | — | — |
| ITV Schools | — | — | — | — |
| ITV Sunday Night Drama | — | — | — | — |
| ITV Sunday Night Theatre | — | — | — | — |
| ITV Telethon | — | — | — | — |
| ITV Television Playhouse | — | — | — | — |
| ITV Weekend News | ITV1 | — | — | — |
| Ivanhoe | ITV | knight film | 1 | 39 |
| Ivanhoe | BBC One | — | 1 | 6 |
| Ivanhoe | — | — | — | — |