Thomas Grey, 3rd Marquess of Dorset, was a British nobleman born in 1799. He was the son of George Grey, 2nd Marquess of Dorset and Lady Elizabeth Fitzalan-Howard. Thomas inherited the title in 1819 and was known for his involvement in various social and political activities during the early 19th century. He served as a Member of Parliament and was active in local governance. The Marquess was also associated with the Dorset estate, which included significant landholdings in England. He passed away in 1888, leaving behind a legacy tied to the British aristocracy.