Sir Patrick Joseph Henry Hannon FRGS FRSA (1874 - 10 January 1963) was an Anglo-Irish Conservative and Unionist Party politician, industrialist and agriculturalist. He served as Member of Parliament (MP) for Birmingham Moseley from 1921 to 1950 and was active in the British Commonwealth Union.
Hannon was the eldest son of Matthew Hannon of Kilfree. He was educated at the Royal College of Science and Royal University of Ireland. He married Mary, daughter of Thomas J Wynne of Castlebar. Hannon was actively involved in Irish agriculture from 1896 to 1904, in particular as an officer of the Irish Agricultural Organisation Society. From 1901 to 1904 Hannon was Director of the Irish Agricultural Wholesale Society and reported on agriculture worldwide. From 1902 to 1907 he visited the United States and Canada on behalf of the Irish Industrial Movement. From 1907 to 1909 he was Director of Agricultural Organisation to the government of Cape Colony and a Justice of the Peace.
Hannon contested Bristol East in 1910 as a Unionist. In the period 1910 to 1914 he was an officer of the Tariff Reform League. He was first elected as a Coalition Unionist in a by-election on 4 March 1921 and served until the United Kingdom general election, 1950. He was President of Aston Villa F.C..