| Honorific Prefix: | Saint |
| Leonorus | |
| Birth Place: | Wales |
| Residence: | Pontual in Brittany |
| Death Date: | 560 |
| Death Place: | Brittany |
| Feast Day: | 1 July |
Saint Leonorus (or Leonorious, Leonorius, Léonor, Lunaire; died 560) was a Welsh monk who was active in Brittany.
Saint Leonorus was born in Wales, son of King Hoel I and Saint Koupaïa (Pompeia of Langoat).He was consecrated as a bishop by Saint Dubricius. He founded a monastery at Pontual to the south of Loctudy, Brittany.He is said to have hung his coat on a sunbeam.He died about 570.His feast day is 1 July.
The monks of St Augustine's Abbey, Ramsgate, wrote in their Book of Saints (1921),
Robert Owen (1820–1902) in his Sanctorale Catholicum under July 1 wrote,
The hagiographer Alban Butler (1710–1773) wrote in his Lives of the Fathers, Martyrs, and Other Principal Saints, under July 1,