William FitzWilliam, 3rd Earl FitzWilliam (1748-1833), was a prominent British nobleman and politician. He served as a Member of Parliament and held various important positions, including Lord Lieutenant of Yorkshire. FitzWilliam was known for his significant contributions to the development of the region and his involvement in local governance. FitzWilliam was also a notable landowner, with extensive estates, including Wentworth Woodhouse, one of the largest country houses in England. His family played a crucial role in the political landscape of the time, and he was involved in various social and economic reforms during his lifetime.