Blanche Adele Ostertag (born August 27, 1872) was an American decorative artist. She is best remembered for her decorative painting and delight in children as subjects. Born in St. Louis, Missouri, she was a pupil of Collin, Laurens, Constant, L'Hermitte and Delance in Paris. Her awards include the Revell prize, for school room decoration, St. Louis. Her work includes mural decorations: "Sailing of the Claremont," New Amsterdam Theatre, New York; "Old Indian Fort," N. W. R. R. Station, Green Bay, Wisconsin; "Everlasting Covenant" (5 panels), "The Songs of David" (3 panels), and mosaics, Husser House, Chicago, 111inois; Illustrations for "Old Songs for Young America." She exhibited in Champ de Mars Salons (1895, 1896) and was a member of the Society of Western Artists.