Aunt Jane's Nieces at Work is a 1909 juvenile novel for girls, written by L. Frank Baum under his "Edith Van Dyne" pen name. It is the fourth of the ten volumes in his Aunt Jane's Nieces series, and continues the story of the three cousins Louise Merrick, Patsy Doyle, and Elizabeth De Graf. Its story begins three days after the end of the previous book, Aunt Jane's Nieces at Millville; Patsy still has a sunburn from her summer on the Millville farm.