William, Grand Duke of Luxembourg or Guillaume, Grand Duke of Luxembourg may refer to: William I of the Netherlands (1772–1843; ), concurrently Grand Duke of Luxembourg William II of the Netherlands (1792–1849; ), concurrently Grand Duke of Luxembourg William III of the Netherlands (1817–1890; ), concurrently Grand Duke of Luxembourg William IV of Luxembourg (1852–1912; ) Guillaume V of Luxembourg (born 1981; )
See also William, Count of Luxembourg (1081–1131; ) Prince Guillaume of Luxembourg (born 1963), youngest child of Jean, Grand Duke of Luxembourg Guillaume (disambiguation) King William (disambiguation) Prince William (disambiguation)