British and Irish History: Biographies
- Hugh Roe ODonnell
- Hugh Todd Naylor Gaitskell
- Humphrey duke of Gloucester
- Humphry Repton
- Hywel
- Iain Duncan Smith
- Ian Richard Kyle Paisley
- Ine
- Isaac Butt
- Isabella
- Isabella Lucy (Bird) Bishop
- Isambard Kingdom Brunel
- J.M.W. Turner
- Jack Cade
- Jalal al-Din Rumi
- James Andrew Broun Ramsay 1st marquess of Dalhousie
- James Barry
- James Brindley
- James Bruce 8th earl of Elgin
- James Bryce 1st Viscount Bryce