Llywelyn (surname)

Llywelyn or ap Llywelyn is a surname, and may refer to:

• Angharad ferch Llywelyn (fl.1260), daughter of Llywelyn ab Iorwerth, Prince of Wales
• Carmen Llywelyn, American actress and photographer
• Dafydd ap Llywelyn (1212–1246), King of Gwynedd
• Dafydd ap Llywelyn ap Madog, Welsh poet of the 16th-century
• Dafydd Llywelyn (composer) (1939–2013), Welsh pianist and composer
• Dafydd Llywelyn (politician) (born 1976), Welsh politician
• Desmond Llewelyn (1914–1999), Welsh actor
• Elen ferch Llywelyn (c. 1207–1253), daughter of Llywelyn the Great of Gwynedd
• Emyr Llywelyn, Welsh political activist
• Llywarch ap Llywelyn (fl.1173–1220), Welsh poet
• Madog ap Llywelyn (died after 1312), leader of the Welsh revolt of 1294–95
• Maredudd ap Llywelyn ap Maredudd ap Cynan, Welsh prince of the 13th century
• Morgan Llywelyn (born 1937), American-Irish author
• Owain ap Llywelyn ab y Moel (fl.1470–1500), Welsh poet from Powys
• Robin Llywelyn (born 1958), Welsh novelist

• Llywelyn (name)
• Llewellyn (surname)
• Llewelyn (surname)
• Lewellen (surname)