Arbeo of Freising (also Aribo of Freising or Arbo of Freising; 723 or earlier at Meran – 4 May 784) was Bishop of Freising.
He was a member of the Benedictine Order. At first a priest and notary under Bishop Joseph of Freising, he became in 763 abbot of the newly-founded monastery of Scharnitz. In 764 he succeeded Joseph as Bishop of Freising.
Arbeo, who is often counted as the first named author in German, is sometimes credited with the composition of the Codex Abrogans, a bilingual vocabulary in Latin and Old High German, often described as the first German book.
He is buried in Freising. His commemoration day in the Catholic Church is 4 May.