Louise Upton Brumback (January 17, 1867 – February 22, 1929) was an American artist and art activist known principally for her landscapes and marine scenes. Her paintings won praise from the critics and art collectors of her time. Writing at the height of her career, a newspaper critic praised her "firmness of character, quick vision, and directness of purpose." She said these traits "proved a solid rock upon which to build up an independent art expression which soon showed to men painters that they had a formidable rival." As art activist, she supported and led organizations devoted to supporting the work of under-appreciated painters, particularly women.