Twin Towns in the UK
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| UK town | UK region | Overseas town/region | Overseas country |
| Ide | Devon | Canteloup | France |
| Ilfracombe | Devon | Herxheim Am Berg | Germany |
| Ilfracombe | Devon | Ifs | France |
| Ilkeston | Derbyshire | Chalons-Sur-Marne | France |
| Ilkley | West Yorkshire | Coutances | France |
| Ilminster | Somerset | Riec-Sur-Belon | France |
| Ilsington | Devon | Brasparts | France |
| Ilsington | Devon | Ste Marguerite D'Elle | France |
| Inchture | Perthshire And Kinross | Fleac | France |
| Ingleton | North Yorkshire | La Chapelle-Des-Marais | France |
| Inkberrow | Worcestershire | Bray-Sur-Somme | France |
| Innerleithen/Traquair/Glen | Scottish Borders | Le Nouvion-En-Thierache | France |
| Instow | Devon | Arromanches-les-Bains | France |
| Inverclyde | Inverclyde | Veulettes-Sur-Mer | France |
| Inverness | Highland | Augsburg | Germany |
| Inverness | Highland | La Baule Escoublac | France |
| Inverness | Highland | St-Valery-En-Caux | France |
| Ipplepen | Devon | Soliers | France |
| Ipswich | Suffolk | Arras | France |
| Irchester | Northamptonshire | Coulon | France |
| Isle Of Wight | Isle Of Wight | Coburg | Germany |
| Isle Of Wight | Isle Of Wight | Ostholstein Lk. | Germany |
| Isle Of Wight | Isle Of Wight | Ponteareas | Spain |
| Isle Of Wight | Isle Of Wight | Tverskoye District | Russia |
| Isleham | Cambridgeshire | Nesles | France |
| Islington | London | Lefkara | Cyprus |
| Islington | London | Southern District | Russia |
| Islington | London | St George's | Grenada |
| Ivybridge | Devon | St-Pierre-Sur-Dives | France |
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