Edling (Welsh: etifedd) was a title given to the agreed successor or heir apparent of a reigning Welsh monarch.^[1] The title comes from the Old English word Æþeling "noble child" (for example, see Edgar the Ætheling), which was used in Anglo-Saxon England before the Norman Conquest to denote one of "royal blood".

The Welsh use had a more precise meaning and denoted the acknowledged heir to the throne, usually the ruler's eldest son, even though any son, legitimate or illegitimate, could be chosen as edling.^[2]