As at the time of answering, June 2016, Steven Davis is the captain of Northern Ireland.
As of May 2012, the captain of the Republic of Ireland national football team is Robbie Keane.
William Porterfield is the captain of the Ireland Cricket team in the 2011 Cricket World Cup.
Trent Johnston was the captain of the Ireland Cricket team in the 2007 Cricket World Cup.
Brian O'Driscoll
2011 ICC world cup. PORTERFIELD, William, captain, Republic of Ireland Cricket team
Brian O'Driscoll.
Ireland's Paul McGinley will captain Europe in the 2014 Ryder Cup.
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Noel Connelly.
Keith Wood
Kevin Mussen.