A Ranjen was a type of monk in the Bajoran religion. (DS9 episode: "'Til Death Do Us Part")
In 2376 several ranjens worked in the Bajoran temple on Deep Space 9 along side Vedeks Capril and Po.
Also in 2376, a ranjen spoke very highly of Istani Reyla during a conversation with Jake Sisko. (DS9 novel: Avatar, Book One)