Pelagius of Constance (died c. 283) was an early Christian deacon and martyr who was martyred during the reign of the Roman emperor Numerian.

[1] Pelagius was born to his wealthy Christian parents from Pannonia.

He was a deacon and was martyred as a young adult after enduring severe torture during the persecution of Christians under Emperor Numerian.

He was first venerated in Novigrad (Cittanova) in Istria, Croatia.

[2] Pelagius is the patron saint of Konstanz and the Cathedral of Konstanz, owing to the transfer of relics that were believed to be his to that city before or around 904 AD.