Ireland Kearney represented Ireland at
schoolboy and U-19 level, and toured with
Ireland A in the
2006 Churchill Cup. Kearney was first called into the Irish training squad for
2005's autumn internationals, but didn't play. He was named in the Irish squad to the
2007 summer tour of Argentina and earned his first cap against
Argentina on 2 June 2007 in a 16–0 defeat. During the
2008 Six Nations Championship he scored two tries, one against
Scotland and one against
England. He was a member of the victorious Ireland team that won the
2009 Six Nations Championship,
Triple Crown and
Grand Slam. One of the most famous incidents in Kearney's career was a high tackle incident involving Italy's
Andrea Masi in the first minute of a game. The incident was taken as an indication of the danger posed by Kearney in attack. Kearney missed almost a year – from November 2010 until August 2011 – due to a knee injury that required surgery. In the
2011 Rugby World Cup, Kearney was selected but was injured for the first game against the
United States; however, he played in all the other matches which took Ireland through to the
quarter-finals, in which they were knocked out by
Wales, 22–10. Kearney was selected in the Ireland squad for the
2012 Six Nations Championship and named in the starting team to play
Wales in the opening match. He played in all the other games, which saw Ireland finish third in the table. Kearney was also in the first Irish rugby team in 39 years to beat Australia on Australian soil, in the
2018 summer series. He was named in the Ireland squad for the
2019 Rugby World Cup in Japan, starting three of Ireland's five matches and splitting time at fullback with
Jordan Larmour.
British & Irish Lions Kearney was named in the
British & Irish Lions squad for the
2009 tour to South Africa. He made his Lions test debut as a substitute in the 26–21 first test defeat in
Durban. Due to an injury to
Lee Byrne, Kearney was selected again for the second test in
Pretoria. He then played in the final test in
Johannesburg which the Lions won 28–9. On 30 April 2013, Kearney was named in his second British & Irish Lions squad. ==Honours==