Frederick of Utrecht was a ninth-century bishop who served the diocese of Utrecht from approximately 815 until his death in 838. Born into a noble Frisian family around 780, he was educated by the clergy in Utrecht before being ordained as a priest. He dedicated much of his early ministry to missionary work, traveling to regions such as Walcheren and Stavoren to convert people to Christianity. He was recognized for his deep learning and religious devotion throughout his ecclesiastical career.