Fionán Lynch (Irish: Fionán Ó Loingsigh; 17 March 1889 – 3 June 1966) was an Irish revolutionary, barrister, politician and judge who served as a Judge of the Circuit Court from 1944 to 1959, Leas-Cheann Comhairle of Dáil Éireann from 1938 to 1939, Minister for Lands and Fisheries from 1930 to 1932, Minister for Fisheries from 1922 to 1930, Minister without portfolio from August 1922 to December 1922 and Minister for Education from April 1922 to August 1922.
He served as a Teachta Dála (TD) from 1918 to 1944.