Saint Malo (French pronunciation: [sɛ̃.ma.lo]; also known as Maclou, Maloù, or in Latin as Maclovius or Machutus, c. 27 March 520 – 15 November 621) was a Welsh mid-sixth century founder of Saint-Malo, a commune in Brittany, France.

Malo's name may derive from the Old Breton machlou, a compound of mach "warrant, hostage" and lou (or loh) "brilliant, bright, beautiful".

He was placed in the abbot's care at a tender age, and grew up at the abbey, where he was ordained priest and assigned the office of preacher.

Another story tells of an encounter with Maclovius, a dead giant whom Brendan temporarily revives and baptizes.

[4] On a second voyage, Brendan and Malo are said to have visited and evangelized locations including Cézembre, the Orkney Islands, and the northern isles of Scotland.

Upon Aaron's death in 544, Malo continued the spiritual rule of the district subsequently known as Saint-Malo and was consecrated as the first Bishop of Aleth (now Saint Servan).