Thomas Ryder Johnson (17 May 1872 – 17 January 1963) was an Irish Labour Party politician and trade unionist who served as Leader of the Opposition from 1922 to 1927 and Leader of the Labour Party from 1914 to 1927. He served as a Teachta Dála (TD) for Dublin County from 1922 to 1927. He was a Senator for the Labour Panel from 1928 to 1934.
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The Irish Oath of Allegiance (Irish: Mionn Dílse) was a controversial provision in the Anglo-Irish Treaty of 1921, which Irish TDs (members of the Lower House of the Irish Parliament) and Senators were required to swear before taking their seats in Dáil Éireann (Chamber of Deputies) and Seanad Éireann (Irish Senate) before the Constitution (Removal of Oath) Act 1933 was passed on 3 May 1933. The controversy surrounding the Oath was one of the principal issues that led to the Irish Civil War of 1922–23 between supporters and opponents of the Treaty.