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.