Thomas Grey, 1st Marquess of Dorset (1457 – September 20, 1501) was the eldest son of Elizabeth Woodville and consequently a stepson of Edward IV of England.

Thomas was Elizabeth's son by her first marriage, to Sir John Grey. He was created Marquess of Dorset on April 18, 1475 and summoned to Parliament on November 15, 1482. In January 1482/3 on the death of his grandmother Elizabeth, he became Lord Ferrers of Groby. He joined the Duke of Buckingham's 1483 rebellion against Richard III. When the rebellion failed he fled to Brittany to join Henry Tudor, the future Henry VII.

Thomas first married Anne Holland, only daughter of Anne of York, dowager Duchess of Exeter and sister of Edward IV. After she died young without issue he married Cecily Bonville, Baroness Harington and Bonville, a niece of Richard Neville Earl of Warwick and stepdaughter of William Hastings, Edward IV's close associate. By the latter marriage Lady Jane Grey was his great-grand-daughter.

He is depicted in William Shakespeare’s play Richard III.