Sir William Robertson Nicoll CH (10 October 1851 – 4 May 1923) was a Scottish Free Church minister, journalist, editor, and man of letters.

He began a highly popular feature, "Correspondence of Claudius Clear", which enabled him to share his interests and his reading with his readers.

[3] Among his other enterprises were The Expositor's Bible (originally published by Hodder & Stoughton, 1887–1896, but afterward reprinted in New York by A. C. Armstrong & Son) and The Theological Educator.

He died on 4 May 1923 at his home, Bay Tree House, in Frognal, Hampstead, London and is buried in a family grave on the west side of Highgate Cemetery.He married twice: firstly in 1878 to Isabella Dunlop (1857–1894); secondly in 1897 to Catherine Pollard (1863–1960).

A new biographical appreciation written by Keith A. Ives was published in 2011: "Voice of Nonconformity: William Robertson Nicoll and the British Weekly”.