William de Crachin (died c. 1274) was a prelate active in the Kingdom of Scotland in the 13th century.

The earliest known Dean of Brechin Cathedral, his first appearance in a surviving source comes 22 September 1248, from a document of Arbroath Abbey.

[1] His surname de Crachin, unknown to historians such as John Dowden, occurs in National Library of Scotland MS 34.6.24 fo.

[4] The Chronica Extracta says that he died, still merely "elect" (i.e. not having received consecration) at the Second Council of Lyons, though there is uncertainty among modern writers about the reliability of this extract.

[5] The Chronica described him as "a man in all things praiseworthy, but of harsh voice".