Following is a list of past and present Members of Parliament (MPs) of the United Kingdom whose surnames begin with I. The dates in parentheses are the periods for which they were MPs. This list is complete for MPs since 1919.

1800s	1801 02 06 07 12 18 20 26 30 31 32 35 37 41 47 52 57 59 65 68 74 80 85 86 92 95
1900s	1900 06 10 Jan 10 Dec 18 22 23 24 29 31 35 45 50 51 55 59 64 66 70 Feb 74 Oct 74 79 83 87 92 97
2000s	2001 05 10 new 15 17 19

By decade of death

By gender

By region

England	Colchester 1885–1983 East Midlands 10 London Conservative Labour Liberal Democrat Kent Wolverhampton England 05 10 15 17 19
Scotland	55 59 64 66 70 Feb 74 Oct 74 79 83 87 92 97 01 05 10 15 17 19
Wales	74 87 92 97 01 05 10 15 17 19
Northern Ireland	92 97 01 05 10 15 17 19

MPs who stood down by election

Other

Brian Iddon (1997–2010)
Edward Iliffe, 1st Baron Iliffe (1923–1929)
Albert Illingworth, 1st Baron Illingworth (1915–1921)
Eric Illsley (1987–2011)
Sir Robert Inglis, 2nd Baronet (1824–1826), (1828–1854)
Adam Ingram (1987–2010)
Thomas Inskip, 1st Viscount Caldecote (1918–1929), (1931–1939)
Tom Iremonger (1954–1974)
Huw Irranca-Davies (2002–present)
Arthur Irvine (1947–1978)
Bryant Irvine (1955–1983)
Michael Irvine (1987–1992)
Charles Irving (1974–1992)
Dan Irving (1918–1924)
Sydney Irving (1955–1970), (1974–1979)
William Irving (1945–1955)
George Isaacs (1923–1924), (1929–1931), (1939–1959)
Rufus Isaacs, 1st Marquess of Reading (1904–1913)