The Moon Maid is a fantasy novel by American writer Edgar Rice Burroughs, belonging to the Lost World sub-genre.

The book is well regarded, and described by one critic, Richard A. Lupoff, as the best of Edgar Rice Burrough's non-series "scientific romances". He describes the book as conveying a remarkable sense of wonder. He goes on to say that the extrapolation of society, including the feudal and nomadic societies of the conquered earth, display new facets of Burrough's skill as a writer. For example, a surviving Stars and Stripes flag which had been in the Battle of Argonne Forest in World War I comes after many generations to be worshipped as a powerful totem by Americans who had reverted to tribal nomadic life on the Great Plains, with the flag's original meaning completely forgotten. P. Schuyler Miller wrote that "Most readers agree that 'The Moon Maid' was Burroughs's best book and best science fiction."

In the late twentieth century, Admiral Julian 3rd can get no rest, for he knows his future. He will be reborn as his grandson in the next century to journey through space and make an ominous discovery inside the moon; he will live again in the dark years of the twenty-second century as Julian 9th, who refuses to bow down to the victorious Moon Men; and as Julian 20th, the fierce Red Hawk, he will lead humanity's final battle against the alien invaders in the twenty-fifth century. The Moon Maid is Edgar Rice Burroughs's stunning epic of a world conquered by alien invaders from the moon and of the hero Julian, who champions the earth's struggle for freedom, peace, and dignity. The most complete version of The Moon Maid saga ever made available, this edition contains the story as published serially, along with numerous passages, sentences, and words excised from the magazine version or added later by the author.