Mark Alexander (February 7, 1792 – October 7, 1883) was a nineteenth-century lawyer and political figure from Virginia.
Born on a plantation near Boydton, Virginia, Alexander attended the public schools as a child and graduated from the University of North Carolina in 1811.
He studied law and was admitted to the bar, commencing practice in Boydton.
He was a member of the Virginia House of Delegates from 1815 to 1819 before he was elected a Democratic-Republican, Crawford Republican and Jacksonian to the United States House of Representatives in 1818, serving from 1819 to 1833, where he served as chairman of the Committee on the District of Columbia from 1825 to 1829.
Alexander then retired from political life and engaged in managing his large plantation until his death in Scotland Neck, North Carolina on October 7, 1883.