William Tudor (March 28, 1750 – July 8, 1819) was an American politician, military officer and lawyer from Boston.

Tudor received a Bachelor of Arts degree from Harvard College in 1769,[1] studied law in the office of John Adams, was admitted to the Massachusetts Bay Colony Bar, July 27, 1772, and became outstanding in his profession.

He joined George Washington's army in Cambridge where he provided legal advice to Washington and, on July 29, 1775, was appointed Judge Advocate of the Continental Army with the rank of colonel, and then Judge Advocate General (ranked Lieutenant-Colonel) on August 10, 1776.

Six of their children survived infancy and early childhood: William Tudor (1779-1830); John Henry (1782–1802), who roomed with Washington Allston at Harvard; Frederic (September 4, 1783 – February 6, 1864); Emma Jane (1785–1865), who married Robert Hallowell Gardiner; Delia (1787–1861), who became the wife of Charles Stewart, captain of the USS Constitution; and Henry James (1791–1864).

Known as "Rockwood", it was from the estate's pond that Tudor's son Frederic began harvesting ice for shipment to the Caribbean.