Osbert of Clare was a 12th-century English monk and writer, known for his contributions to monastic literature. He was associated with the Clare Abbey in Suffolk, where he served as a prior. His works often focused on the spiritual life and the importance of monastic discipline. In addition to his writings, Osbert is recognized for his role in the development of the Cistercian order in England. His influence helped shape the practices and beliefs of monastic communities during a time of significant religious reform and growth in the medieval period.