- 1920, John Lane (New York), October 1920, Hardcover, 296 pp
- 1920, National Book Company, Hardcover, 296 pp
- 1921, John Lane (The Bodley Head), 21 January 1921, Hardcover, 296 pp
- 1926, John Lane (The Bodley Head), June 1926, Hardcover (Cheap edition – two shillings) 319 pp
- 1931, John Lane (The Bodley Head), February 1931 (As part of the Agatha Christie Omnibus along with The Murder on the Links and Poirot Investigates), Hardcover, Priced at seven shillings and sixpence; a cheaper edition at five shillings was published in October 1932
- 1932, John Lane (The Bodley Head), July 1932, Paperback (ninepence)
- 1935, Penguin Books, 30 July 1935, Paperback (sixpence), 255 pp
- 1945, Avon Books (New York), Avon number 75, Paperback, 226 pp
- 1954, Pan Books, Paperback (Pan number 310), 189 pp
- 1959, Pan Books, Paperback (Great Pan G112)
- 1961, Bantam Books (New York), Paperback, 154 pp
- 1965, Longman (London), Paperback, 181 pp
- 1976, Dodd, Mead and Company, (Commemorative Edition following Christie's death), Hardback, 239 pp; ISBN 0-396-07224-0
- 1984, Berkley Books (New York, Division of Penguin Putnam), Paperback, 198 pp; ISBN 0-425-12961-6
- 1988, Fontana Books (Imprint of HarperCollins), Paperback, 208 pp; ISBN 0-00-617474-4
- 1989, Ulverscroft Large Print Edition, Hardcover; ISBN 0-7089-1955-3
- 2007, Facsimile of 1921 UK first edition (HarperCollins), 5 November 2007, Hardcover, 296 pp; ISBN 0-00-726513-1
- 2018, Srishti Publishers & Distributors, Paperback, 186 pp; ISBN 978-93-87022-25-6
Additional editions are listed at Fantastic Fiction, including
- 29 Hardcover editions from 1958 to September 2010 (ISBN 116928986X / 9781169289864 Publisher: Kessinger Publishing)
- 107 Paperback editions from 1970 to September 2013 (ISBN 0007527497 / 9780007527496 (UK edition) Publisher: Harper)
- 30 Audio editions from September 1994 to June 2013 (ISBN 1470887711 / 9781470887711 Publisher: Blackstone Audiobooks)
- 96 Kindle editions from December 2001 to November 2013 (ISBN B008BIGEHG).[22]
The novel received its first true publication as an eighteen-part serialisation in The Times newspaper's Weekly Edition (aka The Times Weekly Edition) from 27 February (Issue 2252) to 25 June 1920 (Issue 2269).[23] This version of the novel mirrored the published version with no textual differences and included the maps and illustrations of handwriting examples used in the novel. At the end of the serialisation an advertisement appeared in the newspaper, which announced, "This is a brilliant mystery novel, which has had the unique distinction for a first novel of being serialised in The Times Weekly Edition. Mr John Lane is now preparing a large edition in volume form, which will be ready immediately." Although another line of the advertisement stated that the book would be ready in August, it was first published by John Lane in the United States in October 1920 and was not published in the UK by The Bodley Head until the following year.
The Mysterious Affair at Styles later made publishing history by being one of the first ten books to be published by Penguin Books when they were launched on 30 July 1935. The book was Penguin Number 6.[24]
The blurb on the inside flap of the dustwrapper of the first edition reads:
This novel was originally written as the result of a bet, that the author, who had previously never written a book, could not compose a detective novel in which the reader would not be able to "spot" the murderer, although having access to the same clues as the detective. The author has certainly won her bet, and in addition to a most ingenious plot of the best detective type she has introduced a new type of detective in the shape of a Belgian. This novel has had the unique distinction for a first book of being accepted by the Times as a serial for its weekly edition.
