William Fitzwilliam, 7th Earl of Southampton (1783-1854), was a British nobleman known for his role in the House of Lords. He inherited the title from his father, the 6th Earl, and was involved in various social and political activities during his lifetime. The 7th Earl was also a patron of the arts and supported several cultural initiatives. He was connected to notable figures of his time, including Charles Dickens and Lord Byron, and his estate included the historic Southampton House in London, which reflected his family's long-standing influence in British society.