Germanus of Auxerre was a western Roman clergyman who was bishop of Autissiodorum in Late Antique Gaul. He abandoned a career as a high-ranking government official to devote his formidable energy towards the promotion of the church and the protection of his "flock" in dangerous times, personally confronting, for instance, the barbarian king "Goar". In Britain he is best remembered for his journey to combat Pelagianism in or around 429 AD, and the records of this visit provide valuable information on the state of post-Roman British society. He also played an important part in the establishment and promotion of the Cult of Saint Alban. The saint was said to have revealed the story of his martyrdom to Germanus in a dream or holy vision, and Germanus ordered this to be written down for public display. Germanus is venerated as a saint in both the Roman Catholic and Orthodox churches, which commemorate him on 31 July.

The diocese of Auxerre is a former French Roman Catholic diocese. Its historical episcopal see was in the city of Auxerre in Burgundy, now part of eastern France. Currently the non-metropolitan Archbishop of Sens, ordinary of the diocese of Sens and Auxerre, resides in Auxerre.