William Montagu, 6th Duke of Manchester (1823-1890), was a British nobleman known for his role in the aristocracy during the 19th century. He inherited the title from his father, the 5th Duke, and was involved in various social and political activities of his time. The Duke was also a landowner, managing estates in England and Scotland. In addition to his noble duties, the 6th Duke was known for his interest in the arts and culture. He was a patron of several artists and contributed to the development of the Manchester area. His legacy includes the continued prominence of the Montagu family in British society.