William Murray Gloag KC (15 March 1865 – 5 February 1934) was a Scottish lawyer and academic.

He was educated at Edinburgh Academy and studied at Balliol College, Oxford, graduating with a first-class degree in modern history in 1888.

The 13th edition of Gloag and Henderson, as it is known, was published in 2012, with Hector MacQueen as the lead author.

[7] Gloag did, John Blackie has observed, "write an awfully large amount of legal literature... the total length of the books in which [he] was sole or joint author with another comes to 2302 pages.

"[8] (Despite this disability, Gloag was an accomplished golfer who achieved a hole in one at the Senate Match between the Universities of Glasgow and Aberdeen in 1907.