King Oscar Fjord (Danish: Kong Oscar Fjord; Greenlandic: Kangerluk Kong Oscar) is a fjord in East Greenland, marking the northern border of the Scoresby Land Peninsula.

The main fjord is 10–25 km wide, bounded by Traill Island and Geographical Society Island in the east.

In the inner and northern end of the fjord lies Ella Island.

The Davy Sound at the southeastern end connects with the Greenland Sea after extending for about 20 km in a NW/SE direction.

[2] The Antarctic Sound separates the Suess Land Peninsula and Ymer Island and connects with the Kaiser Franz Joseph Fjord system to the north.