The Warlord of Mars is a science fiction novel written by Edgar Rice Burroughs, the third of his famous Barsoom series. Burroughs began writing it in June, 1913, going through five working titles; Yellow Men of Barsoom, The Fighting Prince of Mars, Across Savage Mars, The Prince of Helium, and The War Lord of Mars.

John Carter discovers that a First Born knows the secret of the Temple of the Sun and he and the Holy Hekkador Matai Shang want to rescue the Holy Therns daughter who is imprisoned with Dejah Thoris and another Barsoomian princess, Thuvia of Ptarth. John Carter follows them in the hope to liberate his beloved wife. His antagonists manage to stay ahead of him and flee to the north, taking the three previously imprisoned women along. No ordeal can detain John Carter from his quest to be reunited with his wife. He follows them untiring into the undiscovered north polar regions where he discovers more fantastic creatures and ancient mysterious Martian races.