| Ice Factor, The | Kinlochleven | Highland |
| Iceberg Glass-Blowing Studio | Drumnadrochit | Highland |
| Iceni Brewery | Thetford | Norfolk |
| Ickenham Marsh - London Wildlife Trust | Ickenham | Greater London |
| Ickworth House, Park & Gardens | Bury St Edmunds | Suffolk |
| Iden Croft Herbs | Staplehurst, Tonbridge | Kent |
| Iford Manor | Bradford-on-Avon | Wiltshire |
| Ightham Mote | Ivy Hatch, Sevenoaks | Kent |
| Ikon Gallery | Birmingham | West Midlands |
| Ilam Park | Ilam, Ashbourne | Derbyshire |
| Ilfracombe Aquarium | Ilfracombe | Devon |
| Ilfracombe Museum | Ilfracombe | Devon |
| ILPH Belwade Farm | Aboyne | Aberdeenshire |
| ILPH Glenda Spooner Farm | Ross-on-Wye | Herefordshire |
| ILPH Hall Farm | Snetterton | Norfolk |
| ILPH Penny Farm | Peel | Lancashire |
| Imagos Art Gallery | Newry | Co. Down |
| Immingham Museum | Immingham | Lincolnshire |
| Imperial Gardens | Cheltenham | Gloucestershire |
| Imperial War Museum | Lambeth | Greater London |
| Imperial War Museum Duxford | Duxford | Cambridgeshire |
| Imperial War Museum North | Manchester | Greater Manchester |
| Impossible Microworld of Willard Wigan, The | Bath | Bath and North East Somerset |
| Impressions Gallery of Photography | York | York |
| In The Footsteps Of Sherlock Holmes London Walk | Embankment | Greater London |
| Inch Abbey | Downpatrick | Down |
| Inchcape Marine Services | Arbroath | Angus |
| Inchcolm Abbey | Nr Aberdour | Fife |
| Inchmahome Priory | Port of Menteith | Stirling |
| Indian Chief Cruises | Stoke Bruerne | Northamptonshire |
| Indian King Arts Centre | Camelford | Cornwall |
| Industrial Museum | Bristol | Bristol |
| Ingatestone Hall | Ingatestone | Essex |
| Ingleborough Cave | Clapham | North Yorkshire |
| Ingleton Falls | Ingleton | North Yorkshire |
| Ingleton Tourist Information Centre | Ingleton | North Yorkshire |
| Ingram Centre | Ingram, Powburn | Northumberland |
| inhouse quilting | Narberth | Pembrokeshire |
| Inigo Jones Slate Works | Caernarfon | Gwynedd |
| Innerpeffray Chapel | Crieff | Perth and Kinross |
| Innerpeffray Library | Crieff | Perth and Kinross |
| Innisidgen Lower and Upper Burial Chambers | Hugh Town | Isles of Scilly |
| Innocent Fine Art Gallery | Clifton, Bristol | Bristol |
| Insch Connection, The | Insch | Aberdeenshire |
| Insh Marshes Nature Reserve | Insh, Kingussie | Highland |
| Inspire Hands On Science Centre | Norwich | Norfolk |
| Institute of Contemporary Arts | The Mall | Greater London |
| Institute of Visual Culture | Cambridge | Cambridgeshire |
| Instow Signal Box | Instow | Devon |
| Intech Science & Discovery Centre | Winchester | Hampshire |
| Inter-Island Cruises | Dervaig, Mull | Argyll and Bute |
| Interactive Catalyst Science Discovery Centre | Widnes | Halton |
| International Convention Centre | Birmingham | West Midlands |
| International Fire Museum of Power | Tanygroes, Cardigan | Ceredigion |
| International Purves Puppets | Biggar | South Lanarkshire |
| Inveraray Bell Tower | Inveraray | Argyll and Bute |
| Inveraray Castle | Inveraray | Argyll and Bute |
| Inveraray Jail | Inveraray | Argyll and Bute |
| Inveraray Maritime Museum | Inveraray | Argyll and Bute |
| Inveraray Tourist Information Centre | Inveraray | Argyll and Bute |
| Inveraray Woollen Mill | Inveraray | Argyll and Bute |
| Inverawe Fisheries & Smokery Exhibition | Taynuilt | Argyll and Bute |
| Inverbeg Galleries | Inverbeg | Argyll and Bute |
| Inveresk Lodge Garden | Inveresk, Musselburgh | East Lothian |
| Inverewe Garden | Poolewe | Highland |
| Inverkeithing Museum | Inverkeithing | Fife |
| Inverlochy Castle | Fort William | Highland |
| Invernairn Mill Visitor Centre | Nairn | Highland |
| Inverness Airport | Inverness | Highland |
| Inverness Castle | Inverness | Highland |
| Inverness Dolphin Cruises | Inverness | Highland |
| Inverness Leisure | Inverness | Highland |
| Inverness Museum & Art Gallery | Inverness | Highland |
| Inverness Tourist Information Centre | Inverness | Highland |
| Inverurie Golf Club | Inverurie | Aberdeenshire |
| Inverurie Museum | Inverurie | Aberdeenshire |
| Inverurie Tourist Information Centre | Inverurie | Aberdeenshire |
| Inwood | Kilgetty | Pembrokeshire |
| Iona | Isle of Iona | Argyll and Bute |
| Iona Abbey | Isle of Iona | Argyll and Bute |
| Iona Heritage Centre | Isle of Iona | Argyll and Bute |
| Iona House Gallery | Woodstock | Oxfordshire |
| Iona Nunnery | Isle of Iona | Argyll and Bute |
| Iona Pottery | Isle of Iona | Argyll and Bute |
| Ionad Nibheis Visitor Centre | Fort William | Highland |
| Ipswich Museum | Ipswich | Suffolk |
| Ipswich Tourist Information Centre | Ipswich | Suffolk |
| Ipswich Town Football Club Stadium Tour | Ipswich | Suffolk |
| Ipswich Transport Museum | Ipswich | Suffolk |
| Ipswich Unitarian Meeting House | Ipswich | Suffolk |
| Irchester Country Park | Wellingborough | Northamptonshire |
| Irish Linen Centre | Lisburn | Co. Antrim |
| Irish Linen Tour | Banbridge | Co. Down |
| Iron Bridge | Ironbridge, Telford | Shropshire |
| Ironbridge Gorge Museums | Ironbridge, Telford | Shropshire |
| Ironbridge Power Station | Ironbridge, Telford | Shropshire |
| Irvine Tourist Information Centre | Irvine | North Ayrshire |
| Isis Ceramics Ltd | Horton cum Studley | Oxfordshire |
| Island Brass Rubbing Centre | Arreton | Isle of Wight |
| Island Encounter Wildlife and Birdwatch Safaris | Aros, Isle of Mull | Argyll and Bute |
| Island Fortress Occupation Museum | St Helier | Jersey |
| Island Hall | Godmanchester | Cambridgeshire |
| Island Heritage | Healy | North Yorkshire |
| Island Planetarium & Astronomy Resources Centre | Yarmouth | Isle of Wight |
| Islay Airport | Isle of Islay | Argyll and Bute |
| Islay Family History Society | Isle of Islay | Argyll and Bute |
| Islay Natural History Trust | Port Charlotte, Isle of Islay | Argyll and Bute |
| Isle of Anglesey Riding Centre | Dwyran | Anglesey |
| Isle of Arran Distillery | Arran | North Ayrshire |
| Isle of Arran Heritage Museum | Arran | North Ayrshire |
| Isle of Bute Discovery Centre | Rothesay, Isle of Bute | Argyll and Bute |
| Isle of Jura Distillery | Craignure | Argyll and Bute |
| Isle of Man Steam Railway | Douglas | Isle of Man |
| Isle of Mull Angora Rabbit Farm | Bunessan, Isle of Mull | Argyll and Bute |
| Isle of Mull Museum | Tobermory, Isle of Mull | Argyll and Bute |
| Isle of Mull Railway | Craignure, Isle of Mull | Argyll and Bute |
| Isle of Mull Weavers | Craignure, Isle of Mull | Argyll and Bute |
| Isle of Mull Wildlife Expeditions | Isle of Mull | Argyll and Bute |
| Isle of Skye Adventure Cruises | Portree, Isle of Skye | Highland |
| Isle of Skye Brewing Company | Uig, Isle of Skye | Highland |
| Isle of Skye Falconry | Portree, Isle of Skye | Highland |
| Isle of Wight Donkey Sanctuary | Wroxall, Ventnor | Isle of Wight |
| Isle of Wight Lavender | Newport | Isle of Wight |
| Isle of Wight Military History Museum | Cowes | Isle of Wight |
| Isle of Wight Pearl | Brighstone | Isle of Wight |
| Isle of Wight Steam Railway | Havenstreet, Nr Ryde | Isle of Wight |
| Isle of Wight Studio Glass | St Lawrence | Isle of Wight |
| Isle of Wight Wax Works | Brading | Isle of Wight |
| Isle of Wight Zoo | Sandown | Isle of Wight |
| Isleburgh Exhibition | Lerwick | Shetland |
| Isleham Priory Church | Isleham | Cambridgeshire |
| Isles of Scilly Skybus | Penzance | Cornwall |
| Isleworth AIT - London Wildlife Trust | Isleworth | Greater London |
| Islington Visitor Information Centre | Islington | Greater London |
| Itchen Valley Country Park | Eastleigh | Hampshire |
| Ivy Croft Garden | Ivington Green | Herefordshire |
| Ivybridge Tourist Information Centre | Ivybridge | Devon |
| Izaak Walton's Cottage | Nr Great Bridgeford | Staffordshire |
