William of Grandson the Great

William of Grandson, called the Great (died 1386), was a Vaudois knight and the younger son of Peter II of Grandson and Blanche of Savoy. He succeeded his father in 1348 as lord of Sainte-Croix, Cudrefin and Grandcour, and became one of the favourites and councillors of Count Amadeus VI.

In 1364 he was among the first fifteen knights of the Order of the Collar, which the count had just created, and in 1365 he gained rights over Aubonne and Coppet. He served in Savoyard campaigns in the Valais and Italy, and in 1366–1367 went with the count to Greece and Bulgaria.

In 1383 he was an executor of Amadeus VI's will, and in 1384 he knighted the young Amadeus VII at the siege of Sion, two years before his death in 1386.