Louis Auguste Benoist (1803–1867) was a pioneer banker and financier.
Born August 13, 1803, in St.
Louis, Missouri, then a French settlement in Louisiana, and soon to become a possession of the United States under the Louisiana Purchase.
His father, Francois Marie Benoist, and his mother's father, Charles Sanguinet, both arose from prominent families and were among those individuals who were instrumental in laying the foundations for St.