- Iddon, Brian (Dr) July 5, 1940 -
- Idris, Thomas (Mr) 1842 - February 10, 1925
- Iliffe, Edward (Mr) January 25, 1908 - February 15, 1996
- Iliffe, Edward (Sir) 1877 - July 25, 1960
- Iliffe, Robert (Mr) November 22, 1944 -
- Illingworth, Albert (Mr) 1865 - January 23, 1942
- Illingworth, Alfred (Mr) 1827 - January 2, 1907
- Illingworth, Percy (Mr) 1869 - January 3, 1915
- Illsley, Eric (Mr) April 9, 1955 -
- Imbert, Peter (Mr) April 27, 1933 -
- Ince, Henry (Mr) 1829 - 1889
- Ind, William (Mr) March 26, 1942 -
- Inderwick, Frederick (Mr) 1836 - August 16, 1904
- Inge, Peter (Mr) August 5, 1935 -
- Ingestre, (Viscount) 1830 - 1877
- Ingestre, (Viscount) 1803 - 1868
- Ingham, Robert (Mr) 1793 - 1875
- Ingilby, William (Sir) 1783 - 1854
- Ingleby, Holcombe (Mr) 1854 - August 6, 1926
- Inglett-Fortescue, John (Mr) October 23, 1758 - November 25, 1840
- Inglis, Hugh (Sir) April 30, 1744 - August 21, 1820
- Inglis, John (Mr) 1810 - 1891
- Inglis, Robert (Sir) 1786 - 1855
- Ingram, Adam (Mr) February 1, 1947 -
- Ingram, Herbert (Mr) 1811 - 1860
- Ingram, Hugh (Mr) - 1871
- Ingram, William (Sir) 1847 - December 18, 1924
- Ingrams, Davina (Ms) July 10, 1938 - February 24, 2008
- Inman, Philip (Mr) - August 26, 1979
- Innes, Arthur (Mr) 1834 - 1902
- Innes, Hugh (Mr) 1764 - August 16, 1831
- Innes, John (Mr) - November 24, 1838
- Innes-Ker, Guy (Mr) November 18, 1954 -
- Innes-Ker, James (Mr) - April 23, 1879
- Inskip, Piers (Mr) May 20, 1947 -
- Inskip, Robert (Mr) October 8, 1917 - September 20, 1999
- Inskip, Thomas (Mr) 1876 - October 11, 1947
- Irby, Cecil (Mr) July 14, 1897 - October 12, 1972
- Irby, Florance (Mr) May 9, 1837 - January 4, 1877
- Irby, Frederick (Mr) June 9, 1749 - March 23, 1825
- Irby, George (Mr) September 6, 1860 - September 16, 1941
- Irby, George (Mr) December 27, 1777 - March 12, 1856
- Irby, George (Mr) September 14, 1802 - December 22, 1869
- Irby, Gerald (Mr) August 29, 1897 - February 17, 1978
- Irby, Greville (Mr) August 24, 1889 - September 16, 1958
- Irby, Timothy (Mr) March 27, 1939 - February 3, 2007
- Ireland, Thomas (Mr) 1792 - 1863
- Iremonger, Tom (Mr) March 14, 1916 - 1998
- Ironmonger, Richard (Mr) 1772 - 1826
- Ironside, Edmund (Mr) September 21, 1924 -
- Ironside, William (Mr) May 6, 1880 - September 23, 1959
- Irranca-Davies, Huw (Mr) January 22, 1963 -
- Irton, Samuel (Mr) 1796 - 1866
- Irvine, Alexander (Mr) June 23, 1940 -
- Irvine, Arthur (Sir) July 25, 1909 - December 15, 1978
- Irvine, Michael (Mr) October 21, 1939 -
- Irving, Bryant (Mr) 1909 - 1992
- Irving, Charles (Mr) 1923 - 1995
- Irving, David (Mr) 1854 - January 25, 1924
- Irving, John (Mr) - 1853
- Irving, John (Mr) 1767 - November 10, 1845
- Irving, Sydney (Mr) 1918 - 1989
- Irving, William (Mr) 1892 - March 15, 1967
- Isaac, Saul (Mr) 1823 - 1903
- Isaacs, George (Mr) 1883 - April 26, 1979
- Isaacs, Lewis (Mr) 1830 - October 17, 1908
- Isaacs, Rufus (Mr) 1860 - December 30, 1935
- Isaacs, Simon (Mr) May 18, 1942 -
- Isaacson, Frederick (Mr) 1836 - 1898
- Ismay, Hastings (Mr) June 21, 1887 - December 17, 1965
- Iveagh, (Countess of) 1881 - February 16, 1966
14,855 people in total