Caílte (or Caoilte) mac Rónáin was a nephew of Fionn mac Cumhail and a member of the fianna in the Fenian Cycle of Irish mythology. He could run at remarkable speed and communicate with animals, and was a great storyteller. Some poems of the Fenian Cycle are attributed to Caílte.

Caílte and Oisín survived into Christian times and told many old tales of the fianna to Saint Patrick.