Ellis Jacqueline O'Reilly (born 23 February 1998) is a retired[5] English-born female artistic gymnast, who represented Ireland at international competitions, most notably at the 2016 Olympic Games.

[5] Ellis trained in the Europa Gymnastics club, in Crayford, under coach Sam James.

At the Northern Europeans in Limerick in 2015, O’Reilly claimed a number of silver medals including Individual All Around and with the Irish Team.

[4] At the World Championships in Glasgow in October 2015, Ellis secured Ireland their first ever place for an Irish female gymnast at an Olympic test event.

Her older sister Jenna is a four-time amateur British boxing champion so she was given the honour of leading Katie Taylor into the ring for her gold medal fight in London 2012.