| | | |
| Ibsley | Fordingbridge Hundred | Hampshire, Volume 4 |
| Ibstone | Desborough Hundred | Buckinghamshire, Volume 3 |
| Iccomb | Oswaldslow Hundred | Worcestershire, Volume 3 |
| Ickburgh: Hospital of Ickburgh | Religious Houses | Norfolk, Volume 2 |
| Ickenham | Elthorne Hundred (continued) | Middlesex, Volume 4 |
| Ickford | Ashendon Hundred | Buckinghamshire, Volume 4 |
| Ickleford | Hitchin Hundred | Hertfordshire, Volume 3 |
| Icklesham | The Rape and Honour of Hastings | Sussex, Volume 9 |
| Ickleton | Whittlesford Hundred | Cambridgeshire, Volume 6 |
| Ickleton: Priory of Ickleton | Religious Houses | Cambridgeshire, Volume 2 |
| Idbury (including Bould and Foscot) | Wychwood Forest and environs | Oxfordshire, Volume 19 |
| Iden | The Rape and Honour of Hastings | Sussex, Volume 9 |
| Idlicote | Kington Hundred | Warwickshire, Volume 5 |
| Idsworth: Chalton with Idsworth | Finchdean Hundred | Hampshire, Volume 3 |
| Iffley | Bullingdon Hundred | Oxfordshire, Volume 5 |
| Ifield | Bramber Rape (North-eastern Part) | Sussex, Volume 6, part 3 |
| Iford | The Rape and Honour of Lewes | Sussex, Volume 7 |
| Ikanho: Monastery of Ikanho | Religious Houses | Lincolnshire, Volume 2 |
| Ilchester: Dominicans at Ilchester | Religious Houses | Somerset, Volume 2 |
| Ilchester: Hospital of Ilchester | Religious Houses | Somerset, Volume 2 |
| Ilchester: Hospital or Priory at White Hall, Ilchester | Religious Houses | Somerset, Volume 2 |
| Ilchester | Tintinhull Hundred | Somerset, Volume 3 |
| Ilford: Barking and Ilford | Becontree Hundred | Essex, Volume 5 |
| Ilford: Hospital of Ilford | Religious Houses | Essex, Volume 2 |
| Ilford | Becontree Hundred | Essex, Volume 5 |
| Ilford: Little Ilford | Becontree Hundred (continued) | Essex, Volume 6 |
| Illston on the Hill | Gartree Hundred | Leicestershire, Volume 5 |
| Ilmer | Ashendon Hundred | Buckinghamshire, Volume 4 |
| Ilmington | Kington Hundred | Warwickshire, Volume 5 |
| Ilminster: Free Grammar School, Ilminster | Schools | Somerset, Volume 2 |
| Ilsley: East Ilsley | Hundred of Compton | Berkshire, Volume 4 |
| Ilsley: West Ilsley | Hundred of Compton | Berkshire, Volume 4 |
| Impington | Northstowe Hundred | Cambridgeshire, Volume 9 |
| India: Haileybury East India College | Schools | Hertfordshire, Volume 2 |
| Infra: Romsey Extra and Infra | King's Somborne Hundred | Hampshire, Volume 4 |
| Ingham: Priory of Ingham | Religious Houses | Norfolk, Volume 2 |
| Ingleby Arncliffe | Langbaurgh Wapentake (West) | Yorkshire: North Riding, Volume 2 |
| Ingleby Greenhow | Langbaurgh Wapentake (West) | Yorkshire: North Riding, Volume 2 |
| Ingthorpe: Tinwell with Ingthorpe | East Hundred | Rutland, Volume 2 |
| Inkberrow | Oswaldslow Hundred | Worcestershire, Volume 3 |
| Inkpen | Hundred of Kintbury Eagle | Berkshire, Volume 4 |
| Innocents: Hospital of Holy Innocents without Lincoln | Religious Houses | Lincolnshire, Volume 2 |
| Institutions | Clacton, Walton and Frinton. North-East Essex Seaside Resorts [Tendring Hundred] | Essex, Volume 11 |
| Institutions: The City of Chester: Culture, Buildings, Institutions | | Cheshire, Volume 5, part 2 |
| Iping | The Rape of Chichester | Sussex, Volume 4 |
| Ippollitts | Hitchin Hundred | Hertfordshire, Volume 3 |
| Ipsden (including Stoke Row) | The South Oxfordshire Chilterns: Caversham, Goring, and Area | Oxfordshire, Volume 20 |
| Ipsley | Barlichway Hundred | Warwickshire, Volume 3 |
| Ipswich: Cardinal's College, Ipswich | Religious Houses | Suffolk, Volume 2 |
| Ipswich: Carmelite Friars of Ipswich | Religious Houses | Suffolk, Volume 2 |
| Ipswich: Dominican Friars of Ipswich | Religious Houses | Suffolk, Volume 2 |
| Ipswich: Grey Friars of Ipswich | Religious Houses | Suffolk, Volume 2 |
| Ipswich: Hospital of St Leonard, Ipswich | Religious Houses | Suffolk, Volume 2 |
| Ipswich: Introduction, Dunwich, Thetford, Bury St Edmunds, Ipswich and Elementary Schools | Schools | Suffolk, Volume 2 |
| Ipswich: Leper Hospitals of St Mary Magdalen and St James, Ipswich | Religious Houses | Suffolk, Volume 2 |
| Ipswich: Priory of St Peter and St Paul, Ipswich | Religious Houses | Suffolk, Volume 2 |
| Ipswich: Priory of the Holy Trinity, Ipswich | Religious Houses | Suffolk, Volume 2 |
| Irchester with Knuston and Chester-on-the-Water | Higham Ferrers Hundred | Northamptonshire, Volume 4 |
| Ireleth: Kirkby Ireleth | Lonsdale Hundred (North of the Sands) | Lancashire, Volume 8 |
| Ironbridge: Madeley including Coalbrookdale, Coalport, and Ironbridge | The Liberty and Borough of Wenlock (part) | Shropshire, Volume 11 |
| Irthlingborough: College of Irthlingborough | Religious Houses | Northamptonshire, Volume 2 |
| Irthlingborough | Huxloe Hundred | Northamptonshire, Volume 3 |
| Isham | Orlingbury Hundred | Northamptonshire, Volume 4 |
| Island: Hayling Island, including North and South Hayling | Bosmere Hundred | Hampshire, Volume 3 |
| Island: Liberty of Portsmouth and Portsea Island | Portsdown Hundred with the Liberties of Portsmouth and Alverstoke | Hampshire, Volume 3 |
| Island: Sunk Island | Holderness Wapentake | Yorkshire: East Riding, Volume 5 |
| Isleham | Staploe Hundred | Cambridgeshire, Volume 10 |
| Isleworth: Heston and Isleworth | Isleworth Hundred | Middlesex, Volume 3 |
| Isleworth Hundred | | Middlesex, Volume 3 |
| Islington | Ossulstone Hundred (continued) | Middlesex, Volume 8 |
| Islip | Ploughley Hundred | Oxfordshire, Volume 6 |
| Islip | Huxloe Hundred | Northamptonshire, Volume 3 |
| Itchen Abbas | Bountisborough Hundred | Hampshire, Volume 4 |
| Itchen Stoke with Abbotstone | Bountisborough Hundred | Hampshire, Volume 4 |
| Itchenor: West Itchenor | The Rape of Chichester | Sussex, Volume 4 |
| Itchingfield | Bramber Rape (North-western part) | Sussex, Volume 6, part 2 |
| Itchington: Bishop's Itchington | Knightlow Hundred | Warwickshire, Volume 6 |
| Itchington: Long Itchington | Knightlow Hundred | Warwickshire, Volume 6 |
| Its: The Middle Level of the Fens and Its Reclamation | | Huntingdonshire, Volume 3 |
| Iver | Stoke Hundred | Buckinghamshire, Volume 3 |
| Ives: Priory of St Ives | Religious Houses | Huntingdonshire, Volume 1 |
| Ives: St Ives | Hurstingstone Hundred | Huntingdonshire, Volume 2 |
| Ivinghoe | Cottesloe Hundred | Buckinghamshire, Volume 3 |
| Ivinghoe: Priory of Ivinghoe | Ecclesiastical History | Buckinghamshire, Volume 1 |
| Ivychurch: 9. Priory of Ivychurch | The Religious Houses of Wiltshire | Wiltshire, Volume 3 |
| Ixworth: Priory of Ixworth | Religious Houses | Suffolk, Volume 2 |