Gustavus Schmidt (16 June 1795 – 20 September 1877) was an American lawyer and lecturer on Civil Law at the University of Louisiana.
He was educated at the classical school in Jönköpings, where his father, Hans Kristian Schmidt, was a judge of the Aulic Council for the south of Sweden.
He was assigned as counsel for the defendants by Chief Justice John Marshall, to whom he had been introduced by his elder brother, Karl Kristian Schmidt (1792-1872).
He was associated with Henry Clay as co-counsel for the heirs of Claude Joseph Villars Dubreuil (1689-1757) in their suit for the recovery of the land on which the United States Mint stood.
He published weekly reviews of the decisions of the Louisiana Supreme Court in The Daily True Delta for years, and made contributions to periodicals.