Benignus of Armagh (died 467) was the son of Sesenen, an Irish chieftain in the part of Ireland that is now called County Meath.

He was baptised into the Christian faith by Saint Patrick, and became his favourite disciple and his coadjutor in the Diocese of Armagh around AD 450.

He succeeded St. Patrick's nephew Sechnall as coadjutor and became the first rector of the Cathedral School of Armagh.

[3] He was present at the synod that passed the canon recognising "the See Of the Apostle Peter" as the final court of appeals in difficult cases.

However, Tirechán's collections in the Book of Armagh states that Benignus of Kilbannon was the son of Lugni of Connaught.