William Dunbar (1805 – March 18, 1861) was a U.S. Representative from Louisiana. He was born in Virginia in 1805 and completed preparatory studies before moving to Alexandria, Virginia, where he engaged in the practice of law in the early 1830s. Dunbar moved to Louisiana in 1852 and was appointed Associate Justice of the Supreme Court of Louisiana to fill the vacancy caused by the death of Isaac Trimble Preston, Judge Preston and served from September 1, 1852, to May 4, 1853.''Celebration of the Centenary of the Supreme Court of Louisiana'' (March 1, 1913), in John Wymond, Henry Plauché Dart, eds., ''The Louisiana Historical Quarterly'' (1922), p. 118. He was elected as a Democratic Party (United States), Democrat to the Thirty-third Congress (March 4, 1853 – March 3, 1855) representing Louisiana's 1st congressional district. Defeated by a "Know-Nothing" candidate after one term, Rep. Dunbar retired to his sugar plantation in St. Bernard Parish and resided there until his death on March 18, 1861.

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1805 births 1861 deaths Justices of the Louisiana Supreme Court Democratic Party members of the United States House of Representatives from Louisiana 19th-century American politicians 19th-century American judges {{Louisiana-politician-stub