This edited volume brings together work on the evidential systems ofTibetan languages. This includes diachronic research, synchronicdescription of systems in individual Tibetan varieties and papersaddressing broader theoretical or typological questions. Evidentiality inTibetan languages interacts with other features of modality, interactional context and speaker knowledge states in ways that provideimportant perspectives for typologists and our general understanding ofevidential systems. This book provides the first sustained attempt tocapture this complexity and diversity from both a synchronic anddiachronic perspective.