William de Grey, 3rd Baron Walsingham (1797-1868), was a British politician and member of the House of Lords. He succeeded his father, the 2nd Baron Walsingham, in 1831 and was known for his contributions to the Conservative Party during his political career. In addition to his political work, de Grey was involved in various social and charitable activities. He held the title of Lord Lieutenant of Norfolk and was recognized for his commitment to public service and community welfare throughout his life.