Stephen Lucius Gwynn (13 February 1864 – 11 June 1950) was an Irish journalist, biographer, author, poet and Protestant Nationalist politician. As a member of the Irish Parliamentary Party he represented Galway city as its Member of Parliament from 1906 to 1918. He served as a British Army officer in France during World War I and was a prominent proponent of Irish involvement in the Allied war effort. He founded the Irish Centre Party in 1919, but his moderate nationalism was eclipsed by the growing popularity of Sinn Féin.