William Fitzwilliam, 6th Earl Fitzwilliam (1780-1833), was a British nobleman and politician known for his significant contributions to the Whig Party. He inherited the title from his father and became a prominent figure in the House of Lords, advocating for social reforms and the abolition of slavery. Fitzwilliam was also a notable landowner, managing vast estates in Yorkshire and Ireland. His wealth allowed him to support various charitable causes and cultural institutions, including the British Museum. He was recognized for his progressive views and commitment to improving the lives of his tenants and the broader community.