William de Grandison, 1st Baron Grandison

William de Grandison (died 1335), was an English noble, and Deputy Justiciar of North Wales.

William was a younger son of Pierre de Grandison and Agnes Neufchâtel.

He was the younger brother of a key ally and envoy, for King Edward I of England, Otto de Grandson, Grandison being an anglicisation of Grandson.

[1] During 1292, he was granted a license to crenellate his manor of Ashperton, Herefordshire.

William secondly married Sybil, daughter of John de Tregoz and Mabel FitzWarin.

Coat of arms of William de Grandison, Paly of six Argent and Azure, on bend Gules, three eagles displayed Or.