John James Brennan (Irish: Seán Séamus Ó Braonáin) (28 November 1887 – 11 October 1943) was a famous Irish sportsman who played hurling with Kilkenny.
He was successful also in playing rugby, winning the Leinster Junior Cup with Kilkenny in 1920.
He played in the All-Ireland Senior Hurling Championship in 1905, 1911, 1912, 1913.
Brennan was a doctor who worked in Kilkenny, as a ship's surgeon with the Cunard Line on the Mauretania, and later in London, before returning to Kilkenny, where he died in 1944.
This Kilkenny hurling biographical article is a stub.