William Fraser (died 1297) was a late 13th century Bishop of St Andrews and Guardian of the Kingdom of Scotland.

Before election to the bishopric, he had been and Royal Chancellor of King Alexander III of Scotland and dean of Glasgow.

He was elected to the bishopric on 4 August 1279 and confirmed in the position the following year by Pope Nicholas III William was one of the leading political figures in the kingdom during the crisis that emerged in the aftermath of King Alexander.

He was buried in the Church of the "Preaching Friars" on the Rue Saint-Jacques in Paris.

His heart was returned to St Andrews and was buried in the wall of the church by his successor, William de Lamberton.