Ethelton is a north-western suburb of Adelaide 13 km (8.1 mi) from the CBD, on the Lefevre Peninsula, in the state of South Australia, Australia. It is a residential suburb within the local government area of City of Port Adelaide Enfield, adjacent to the suburbs of Semaphore, Semaphore South, Glanville and New Port. It is bounded to the north by Hart Street, to the south by Bower Road and in the west by Swan Terrace and in the east by Causeway Road.

The 333 bus, which runs between North Haven and Port Adelaide, services Bower Road and Hart Street. The suburb is also served by the 651, 657, 662, 665, and 672 school bus services, however, these are not accessible to the general public.