Ksenofondos monastery (Greek: Μονή Ξενοφώντος) is an Orthodox Christianmonastery in the monastic state of Mount Athos in Greece.
It is built by the sea, standing on the western shore of the Athos peninsula. It was built in the tenth or eleventh century. The monastery is dedicated to St George and has 11 chapels inside and 6 outside.
The monastery ranks sixteenth in the hierarchy of the Athonite monasteries. The community has about 30 working monks.
The library contains c. 300 manuscripts and 4000 printed books.