- Iddon, Brian (Dr) 1162
- Idris, Thomas (Mr) 12
- Iliffe, Edward (Sir) 63
- Illingworth, Albert (Mr) 991
- Illingworth, Alfred (Mr) 531
- Illingworth, Percy (Mr) 308
- Illsley, Eric (Mr) 1264
- Ince, Henry (Mr) 33
- Inderwick, Frederick (Mr) 48
- Ingestre, (Viscount) 76
- Ingestre, (Viscount) 11
- Ingham, Robert (Mr) 105
- Ingilby, William (Sir) 20
- Ingleby, Holcombe (Mr) 80
- Inglis, Robert (Sir) 1305
- Ingram, Adam (Mr) 9446
- Ingram, Herbert (Mr) 19
- Ingram, William (Sir) 5
- Innes, Arthur (Mr) 1
- Inskip, Thomas (Mr) 3745
- Iremonger, Tom (Mr) 2109
- Irranca-Davies, Huw (Mr) 377
- Irton, Samuel (Mr) 14
- Irvine, Arthur (Sir) 3893
- Irvine, Michael (Mr) 290
- Irving, Bryant (Mr) 1
- Irving, Charles (Mr) 948
- Irving, David (Mr) 124
- Irving, John (Mr) 6
- Irving, Sydney (Mr) 3065
- Irving, William (Mr) 107
- Isaac, Saul (Mr) 47
- Isaacs, George (Mr) 6844
- Isaacs, Lewis (Mr) 86
- Isaacs, Rufus (Mr) 1913
- Isaacson, Frederick (Mr) 271
- Iveagh, (Countess of) 20
9,582 people in total