Canna was a sixth-century mother of saints and later a nun in south Wales, to whom two Welsh churches are dedicated.

According to the writings of the unreliable Iolo Morganwg, Canna was a daughter of King Tewdwr Mawr of Armorica (modern-day Brittany) and Cornwall.

[1] Canna was reputedly the sister-in-law and cousin of Illtud, and possibly established the church at Llangan, near Llantwit, due to its proximity to him.

She married Sadwrn, her first cousin or uncle; together they accompanied Saint Cadfan to Britain and founded two churches, one in Carmarthenshire and another in Anglesey.

[2] Her name also appears as part of two Cardiff districts: Canton (English translation of the Welsh Treganna, Saint Canna's Town); and Pontcanna (Welsh for Canna's Bridge).