Timothy Michael Sullivan (6 January 1874 – 12 May 1949) was an Irish judge who served as Chief Justice of Ireland from 1936 to 1946, a Judge of the Supreme Court from 1924 to 1946, President of the High Court and a Judge of the High Court from 1924 to 1936. His cousin Maurice Healy in his celebrated memoir "The Old Munster Circuit" portrays Timothy as a kindly, serious young man; Mr. Justice MacKenzie in his memoir "Lawful Occasions" recalled the much older Sullivan, then Chief Justice, as "an old-fashioned Irish gentleman, quiet living".