Aunt Jane's Nieces at Work is a 1909 young adult novel, written by L. Frank Baum, famous as the creator of the Land of Oz. It is the fourth volume in the ten-book series Aunt Jane's Nieces, which was the greatest success of Baum's literary career after the Oz books themselves. Like the other books in the series, it was issued under the pen name "Edith Van Dyne," one of Baum's multiple pseudonyms.