Gwendoline Butler, ne Williams (19 August 1922 - 5 January 2013) was a British writer of mystery fiction and romance novels since 1956, she also used the pseudonym Jennie Melville. Credited for inventing the "woman's police procedural", is well known for her series of Inspector John Coffin novels as Gwendoline Butler, and by female detective Charmian Daniels as Jennie Melville.