Michael Louis Hearn (1866 – 1 May 1931) was an Irish Nationalist Member of the Parliament of the United Kingdom for South Dublin, 1917–18.
He was admitted as a solicitor in 1889, and built up an extensive practice, becoming President of the Incorporated Law Society.
He was active in the Nationalist movement from early manhood, working on organization and electoral registration in South Dublin.
Hearn was elected unopposed for South Dublin in a by-election on 6 July 1917, following the death of William Cotton.
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