Owain (Welsh pronunciation: [ˈoːwain]) is a name of Welsh origin. variously written in Old Welsh as Ou(u)ein, Eug(u)ein, Euguen, Iguein, Yuein, and Ouein, and in Middle Welsh as Ewein, Owein, and Ywein. Other variants of the name Owain include Ewein, Iguein, Owein, Ouein, Ywen, Ywein, Ywain, Yuein, and Yvain. Owain has also been Latinized as "Oenus". According to T.J. Morgan, the name is a derivation of the Latin Eugenius.
Owain is one of the few Welsh names to be consistently popular over the last 100 years in England and Wales, particularly with the spelling Owen (and pronunciation /ˈoʊwən/). Patronymics include "Bowen" (from "[a]b Owain") and Owens.
People with the name Owain include:
- Owain mab Urien (d. c. 595), son of Urien, king of Rheged c. 590, and fought with his father against the Angles of Bernicia. He is remembered as Sir Ywain in Arthurian legend
- Owain Gwynedd (c. 1100–1170), aka "Owain ap Gruffydd", considered most successful of all the north Welsh princes prior to his grandson, Llywelyn the Great
- Owain Cyfeiliog (c. 1130 - 1197), prince of part of Powys and a notable poet
- Owain Goch ap Gruffydd (in English, "Owain the Red") (died c. 1280), brother of Llywelyn the Last of Gwynedd
- Owain Owain, one of the founders of the Welsh Language Society; poet, writer, philosopher
- Owain Lawgoch (in English "Owain of the Red Hand", also known as Owain ap Thomas ap Rhodri) (c. 1330 - 1378), great-nephew of Llywelyn the Last and claimant to the throne of Wales
- Owain Glyndŵr, sometimes anglicised as Owen Glendower (1359–c. 1416), last Welshman to hold the title Prince of Wales, and descendant of the princes of Powys
- Owain Ddantgwyn, Prince of North Wales, proposed as possible candidate for the "real" King Arthur
- Owain of Strathclyde (disambiguation), the name of several kings of Strathclyde
- Owain Yeoman, Welsh actor, currently starring on Turn: Washington's Spies as the notorious American traitor Benedict Arnold
- Owain, character from the tactical role-playing video game Fire Emblem: Awakening
- Owen (anglicised form of the name)