William de Lamberton, sometimes modernized as William Lamberton, was Bishop of St Andrews from 1297 until his death. Lamberton is renowned for his influential role during the Scottish Wars of Independence. He campaigned for the national cause under William Wallace and later Robert the Bruce. As Bishop of St Andrews, the most powerful seat in Scotland, Bishop Lamberton along with Bishop Robert Wishart of Glasgow conducted the coronation of Robert the Bruce as King Robert I. Lamberton would go on to have a vital role in the formulation of the Declaration of the Clergy 1310 and the Declaration of Arbroath which would lead to Scottish Independence.

The Bishop of St. Andrews was the ecclesiastical head of the Diocese of St Andrews in the Catholic Church and then, from 14 August 1472, as Archbishop of St Andrews, the Archdiocese of St Andrews.