Frances Isabelle Lockwood Brundage (1854–1937) was an American illustrator best known for her depictions of attractive and endearing children on postcards, valentines, calendars, and other ephemera published by Raphael Tuck & Sons, Samuel Gabriel Company, and Saalfield Publishing. She received an education in art at an early age from her father, Rembrandt Lockwood. Her professional career in illustration began at seventeen when her father abandoned his family and she was forced to seek a livelihood.

In addition to ephemera, Brundage illustrated children's classics such as the novels of Louisa May Alcott, Johanna Spyri, and Robert Louis Stevenson, and traditional literary collections such as The Arabian Nights and the stories of King Arthur and Robin Hood. She was a prolific artist, and, in her late 60s, was producing as many as twenty books annually. Her work is highly collectible.