Sanita Puspure (30) qualified for the Olympics by placing fourth in the Olympic Qualifier in Lucerne last May.
She is Ireland's only competitor in rowing at the Games.
The last time Ireland had a woman rower at the Olympic Games was in 1980. Frances Cryan finished seventh in the single scull.
Born in Riga, she competed at underage level for Latvia, with a bronze medal in the single at the World under-23 Championships in 2003 and a gold in the double scull at the World Student Games in 2004.
She moved to Ireland in 2006 and by early 2008 was impressing with Commercial, and then with Old Collegians.
In 2009 she won the senior single sculls title at the Irish Championships.
Puspure was fifth at the World Cup in Belgrade in 2012.
Her surname is pronounced PUSH PURR.
First in action on 28 July in the heats. Session start time is 9.30am.