Abba Or of Nitria (also Hor or Horus) was an Egyptian Orthodox Christian ascetic who lived around the 4th century AD in Egypt in Dalga, Nitria (Lower Egypt), the Thebaid, and in the deserts around Shaina. He is one of the lesser-known Desert Fathers, but is nevertheless regarded as one of the "chief among monks," being, "a man who stood out among many of the fathers." He is associated with Theodore and Sisoes the Great. According to Jerome, at one point during his life, Or was the father of "one thousand [cenobitic] monks" in the Egyptian Desert. Or died c. 390.