Carbery made two appearances for Ireland during the 2019 Six Nations Championship, featuring off the bench in their opening 32–20 defeat against England on 2 February, before coming on during the first-half to replace the injured Jonathan Sexton to play a key role in Ireland's 22–13 win against Scotland one week later, though a hamstring injury and the form of Connacht's Jack Carty prevented Carbery from gaining further playing time during the tournament.