For the first time in Greece, all available records regarding cetaceans in the Greek Seas since 1840, have been elaborated and entered in a database. These data have been collected from dedicated surveys, stranding events, opportunistic sightings and published or unpublished photographic and video documents, during the last decade (1991-2000). The database accounts for almost 1000 entries of scientifically confirmed sightings and strandings of ten cetacean species. The project is a collaboration of Pelagos Cetacean Research Institute with the National Centre for Marine Research (NCMR). The results were presented in the 15th Conference of the ECS (European Cetacean Society), in May 2001 in Rome and were also published in 1993 by the Hellenic Centre for Marine Research in a dedicated scientific monography.