Princess Martha Coast is that portion of the coast of Queen Maud Land lying between 05° E and the terminus of Stancomb-Wills Glacier, at 20° W. The entire coastline is bounded by ice shelves with ice cliffs 20 to 35 m high.

Princess Martha Coast was the first portion of Antarctic mainland discovered by a human, Fabian von Bellingshausen and Mikhail Lazarev in 1820. The name "Crown Princess Martha Land" was originally applied by Capt. Hjalmar Riiser-Larsen to that section of the coast in the vicinity of Cape Norvegia which he discovered from the Norvegia and roughly charted from the air during February 1930.