Blainville's beaked whales (also referred to as densebeaked whales) occur in temperate and tropical waters of all oceans (Mead 1989). This species has the most extensive distribution of any species of the genus Mesoplodon, and is also the most tropical of the genus (Pitman 2002; MacLeod et al. 2006). Sightings are common around some oceanic archipelagos, like the Hawaiian (USA) and Society Islands (French Polynesia). They occur in many enclosed seas with deep water, such as the Gulf of Mexico, Caribbean Sea, and the Sea of Japan. However, there are only rare records of this species occurring in the Mediterranean, and therefore the species is considered to be a vagrant there.