| Philotheus of Sinai | |
| Birth Date: | c. 9th or 10th century |
| Residence: | Saint Catherine's Monastery, Mount Sinai |
| Death Date: | c. 9th or 10th century |
| Influences: | John Climacus |
| Tradition: | Sinaitic ascetic tradition |
| Major Works: | 40 Texts on Watchfulness |
Philotheus of Sinai was a Christian monk and writer who lived in Egypt. He lived sometime before 1100 – most likely during the 9th century, or possibly the 10th century. Very little is known about his life.
Philotheus was the hegumen of Saint Catherine's Monastery (also known as the Monastery of the Burning Bush) in the Sinai Peninsula.[1]
Philotheus of Sinai followed the Sinaitic ascetic tradition of John Climacus.[1] His writings are similar to those of Hesychius of Sinai.[2] These three monks of Sinai (namely John Climacus, Hesychius of Sinai, and Philotheus of Sinai) are often considered to form a single Sinaitic literary and religious tradition.[3]
His 40 Texts on Watchfulness (Greek, Modern (1453-);: νηπτικὰ κεφάλαια|translit=nēptiká kephálaia) are included in the Philokalia.[2]