Aunt Jane's Nieces in the Red Cross is a young adult novel written by L. Frank Baum, famous as the creator of the Land of Oz. It is the tenth and final volume in Baum's Aunt Jane's Nieces series of books for adolescent girls — the second greatest success of his publishing career, after the Oz books themselves. As with all the previous books in the series, Aunt Jane's Nieces in the Red Cross was released under the pen name "Edith Van Dyne," one of Baum's various pseudonyms.
The book is noteworthy in Baum's canon for its expression of his views and feelings on World War I.
The novel opens on 7 September 1914; the continuing characters Patsy Doyle, Beth De Graf, and their uncle John Merrick are reading a newspaper account of the end of the Siege of Maubeuge and the German victory. Both of the girls are intensely concerned with the war news; Beth in particular is a partisan of the French cause.
The protagonists are soon re-united with "Ajo" Jones and the movie star Maud Stanton, two characters from the previous book in the series, Aunt Jane's Nieces Out West. (Baum arrived at Maud Stanton's name by combining his wife's first name, Maud, with his mother's maiden name, Stanton.) Maud Stanton takes the place of the third of the trio of cousins, Louise Merrick, who does not appear in the final book.