Buddhist monasticism is an important part of the Tibetan Buddhist tradition, all the major and minor schools maintain large monastic institutions based on the Mulasarvastivada Vinaya (monastic rule) and many religious leaders come from the monastic community.
That being said, there are also many religious leaders or teachers (called Lamas and Gurus) which are not celibate monastics.
This list contains some of the most well known Tibetan Buddhist organizations around the .