William FitzWilliam, 4th Earl FitzWilliam (1748-1833), was a prominent British nobleman and politician. He served as a member of the House of Lords and held various political positions, including Lord Lieutenant of Yorkshire. FitzWilliam was known for his extensive landholdings and influence in the region. FitzWilliam was also a significant figure in the Whig Party, advocating for reform and social improvement. He played a role in the management of his estates, promoting agricultural advancements and supporting local communities. His legacy includes contributions to both politics and the development of the Yorkshire area.