David John Nicoll (8 December 1859 – 2 March 1919) was a British anarchist newspaper editor, writer, poet and public speaker. Nicoll replaced William Morris as the editor of the Socialist League's newspaper Commonweal in 1890 until 1892 when Nicoll was imprisoned for incitement to murder a police inspector, a judge and the Home Secretary. Nicoll produced a series of pamphlets critical of the police and singling out those in the anarchist movement he believed to be police spies. Following his imprisonment Nicoll's mental health deteriorated and he died in poverty.