Lucius Henry Gwynn (5 May 1873 – 23 December 1902) was an Irish academic and sportsman who was noted for his prowess in both rugby union football and cricket.

He was the fourth son of the Very Rev John Gwynn, Regius Professor of Divinity at Trinity College Dublin, and Lucy Josephine, daughter of the Irish patriot William Smith O'Brien.

[3] He and his three immediate younger brothers Arthur, Robin and Jack all in turn captained their school and university cricket teams and played the game at first class level.

Primarily noted for his bowling prowess during early outings with the Dublin University XI, Gwynn took 44 wickets at an average of 8.14 in Trinity's annus mirabilis of 1893, a season which witnessed victories over Leicestershire, Oxford University, Warwickshire (dismissed for a paltry total of 15 runs) and a draw against Essex.

[4] Gwynn's irrepressible form reputedly earned him an invitation to represent England against Australia in the second Ashes Test at Old Trafford in July 1896.

[7] Remarkably, Gwynn also represented Ireland seven times at rugby union, debuting against Scotland at Belfast in February 1893.