Alexander Craig Sellar (17 October 1835 – 16 January 1890) was a Scottish lawyer and Liberal Party (later Liberal Unionist) politician. Sellar was the son of Patrick Sellar of Westfield, Morayshire, a lawyer, factor and sheep farmer, and his wife Ann (née Craig). He was educated at Rugby School, and at Balliol College, Oxford where he was a favoured student of Benjamin Jowett. He became a Scottish Advocate in 1862 and was legal secretary to the Lord Advocate for Scotland from 1870 to 1874. In 1873 he published Manual of the Education Act for Scotland. He was a Justice of the Peace and Deputy Lieutenant for Argyllshire.