Sir William Savile, 3rd Baronet of Thornhill was an English politician who sat in the House of Commons between 1640 and 1642. He fought on the Royalist side in the English Civil War and was killed in action.

Thornhill is a village and former township on the southern outskirts of Dewsbury in the Kirklees district of West Yorkshire, England. Historically part of the West Riding of Yorkshire, Thornhill was absorbed into Dewsbury County Borough in 1910. It is located on a hill on the south side of the River Calder, and has extensive views of Dewsbury, Ossett and Wakefield. It is known for its collection of Anglo-Saxon crosses.