Samuel Lewis Southard (June 9, 1787 – June 26, 1842) was a prominent U.S. statesman of the early 19th century, serving as a U.S. Senator, Secretary of the Navy, and the tenth Governor of New Jersey.
The son of Henry Southard and brother of Isaac Southard, he was born in Basking Ridge, New Jersey, attended the Brick Academy classical school and graduated from Princeton University in 1804. He is descended from one of the earliest settlers of New Amsterdam, Anthony Janszoon van Salee.
After teaching school in New Jersey, he worked for several years as a tutor in Virginia and studied law there. Upon being admitted to the bar, he returned to New Jersey, where he was appointed law reporter by the New Jersey Legislature in 1814. Elected to the New Jersey General Assembly in 1815, Southard was appointed to the New Jersey Supreme Court to succeed Mahlon Dickerson shortly thereafter, and in 1820 served as a presidential elector. He was elected to a seat in the United States Senate over James J. Wilson and was appointed to the remainder of Wilson's term when he resigned, and served in office from January 26, 1821, to March 4, 1823 when Southard himself resigned. During this time, he was a