Lebuinus (also known as Lebuin, Lebwin or Liafwin[e]; died c. 775) was a medieval Christian monk who is the Apostle of the Frisians and patron saint of the city of Deventer in the Netherlands.

After his ordination, he proceeded in 754 to Utrecht, and was welcomed by Gregory, acting bishop of that place, who entrusted him with the mission of Overijssel on the borders of Westphalia, and gave him a companion - Marchelm (or Marcellinus), a disciple of Willibrord.

[1] Lebuinus preached the Gospel among the tribes of the district, and erected a little chapel at Wilp (see: Voorst) (Wilpa) on the west bank of the IJssel.

His venerable personality and deep learning quickly won many to Christianity, even among the nobles, and it soon became necessary to build at Deventer on the east bank of the river a larger church.

[1] After escaping with difficulty, Lebuinus determined to voice the claims of Christianity at the national assembly (Allthing) of the Saxons at Marklo near the Weser (Northwestern Germany).