William Sandys
William Sandys may refer to:
- William Sandys, 1st Baron Sandys, English diplomat
- William Sandys, 3rd Baron Sandys
- William Sandys, 4th Baron Sandys
- William Sandys, 6th Baron Sandys, Cavalier officer in the Royalist army during the English Civil War
- William Sandys (MP for Winchester), English MP and magistrate
- William Sandys (waterworks engineer), English MP and waterworks engineer
- William Sandys (antiquarian), English antiquarian and Christmas carol collector