William Grindecobbe or William Grindcobbe was one of the peasant leaders during the English Peasants' Revolt of 1381.
His name implies that he was a miller of grain.
Along with Wat Tyler and John Wrawe, he was one of the key leaders of the peasants during the , revolt of 1381, leading the townspeople of St Alban's on 15 June.
He was executed in 1381 along with John Wrawe and John Ball. His trial and execution was overseen by Henry le Despenser.
During the Peasants' Revolt of 1381, he became well known for his actions against the high lord Thomas de la Mare, Abbot of St. Albans.
Although he was executed along with other leaders of the Revolt, his trial was deemed to have been a fair trial.
Most of the details about his life have been derived from the writings of Thomas Walsingham, who was a monk resident in an abbey.