| Honorific Prefix: | Saint |
| Glastian | |
| Honorific Suffix: | of Kinglassie |
| Birth Place: | Scotland |
| Death Date: | 830 |
| Death Place: | Kinglassie, Fife |
| Canonized Date: | Pre-congregation |
| Feast Day: | 28 January |
| Patronage: | Kinglassie, Fife, Scotland |
Saint Glastian of Kinglassie (or Glastianus, Glascianus; died 830) was a bishop based in Fife who acted as a mediator in the wars between the Picts and the invading Scots.His feast day is 28 January.
The church in Kinglassie, which belonged to Dunfermline Abbey, was dedicated to Saint Glastian.It was near to St. Glastian's Well.It is quite possible that the surname M'Glashan comes from Glastian.
The monks of St Augustine's Abbey, Ramsgate wrote in their Book of Saints (1921),
Alexander Penrose Forbes (1817–1875) in his Kalendars of Scottish Saints wrote,
The hagiographer Alban Butler (1710–1773) wrote in his Lives of the Fathers, Martyrs, and Other Principal Saints under January 28,