The group are just back from touring the US, but still managed a pit stop at Temple Street Hospital to perform for some of the children there.
The hospital recorded the visit and uploaded the clip to their youtube channel on Thursday.
They said: "For some of the children in hospital for a long time, music is a lifeline, it's therapy for them. For the boys to come in and sing to them - it was just magical. Words cannot describe what a morale boost it is for the patients for someone like Kodaline to visit them at their bedside. It really does brighten lives."