Jacob Gartner Lauman (January 20, 1813 – February 9, 1867) was a prominent American businessman from Iowa and a controversial general in the Union Army during the American Civil War.
He commanded an infantry brigade in the Army of the Tennessee in several campaigns in the Western Theater, and then led a division during the 1863 Vicksburg Campaign, where his inadequate performance in the Siege of Jackson led to his being sent home for the rest of the war without a subsequent command.