Two Risso's Dolphins (Grampus griseus; Cetacea: Delphinidae) were recorded in the Sagami Bay in the first half of 2018. The first individual was a young male, with a body length of 2550 mm, stranded on the Katase Nishihama Coast of Fujisawa City on January 28, 2018. The second individual was a male calf with a body length of 1840 mm, found drifting along the Tsujido Higashi Kaigan Coast of Fujisawa City on June 2, 2018. There have been 54 reports of this species from the coasts of Sagami Bay and Tokyo Bay, recorded over 60 years between 1958 and 2018. This study reports on the sighting of the two stray individuals in 2018, as well as presents an overview of the observational records from the past 60 years.
