Arrowsmith Peninsula is a cape about long on the west coast of Graham Land, west of Forel Glacier, Sharp Glacier and Lallemand Fjord, and northwest of Bourgeois Fjord, with Hanusse Bay lying to the northwest. It was surveyed by the Falkland Islands Dependencies Survey in 1955-58 and named for Edwin P. Arrowsmith, Governor of the Falkland Islands.