The former French Catholic Diocese of Noyon lay in the north-east of France, around Noyon. It was formed when Saint Medardus moved the seat of the bishopric at Vermandois to Noyon, in the sixth century. For four centuries it was united with the bishopric of Tournai as the Diocese of Noyon–Tournai. Then in the twelfth century it was again independent, and the bishop of Noyon became a pairie-comté of France.

Eligius, venerated as Saint Eligius, was a Frankish goldsmith, courtier, and bishop who was chief counsellor to Dagobert I and later Bishop of Noyon–Tournai. His deeds were recorded in Vita Sancti Eligii, written by his friend Audoin of Rouen.