Maelgwn is a Middle Welsh personal name meaning 'Princely Hound', stemming from Common Brittonic *''Maglo-kunos'', attested in Latin as ''Maglocunus''. A number of Welsh kings and princes have borne the name:
* Maelgwn Gwynedd (died 547), king of Gwynedd
*Maelgwn ab Owain Gwynedd (died c. 1173), son of Owain Gwynedd and ruler of Anglesey
* Maelgwn ap Rhys (c. 1170 - 1230), son of Rhys ap Gruffydd and ruler of part of Deheubarth
{{hndis