Andrew Chatto (11 November 1840 – 15 March 1913) was an English book publisher who was renowned for the cordial relations he maintained with his authors.
 Chatto was born on 11 November 1840 at 55 Pratt Street, Camden Town London. His parents were the author William Andrew Chatto (1799 – 1864) and Margaret Roberts (c. 1804 – April 1852).
 Chatto was 15 when he joined the book-selling business of John Camden Hotten (12 September 1832 – 14 June 1873). He was probably apprenticed to Hotten at his father's instigation. He began as a 'runner' at book auctions. Hotten had opened a small bookshop at London at 151b Piccadilly the year before Chatto joined the firm. as Hotten diversified into publishing and Chatto learned the trade as Hotten did.: 10 
 Chatto is generally regarded as having had four illegitimate children by his mistress Catherine (later Katharine) Wallace Heard (c. 1839 – 11 October 1905) (Mrs Radway), the daughter of Frederick Augustus Heard (1809 – second quarter of 1883),  a military tailor, and his wife Amelia Hollis Emmett (1809 – ) who had married on 37 October 1829 at St. Giles, Camberwell, London . Catherine had married Joshua Carby Radway (c. 1836 – 27 December 1892) in the second quarter of 1858 in the parish of St. James's in London. Census information suggests that Catherine had seven children, four of whom (namely Thomas, Andrew, Isabel, and Dorothea) were acknowledged in his will to have been sired by Chatto: 
 The 1871 census found Chatto living in the same house as Katharine, her husband Mr Radway, and her two youngest children Joshua and Thomas. Thomas had been registered at birth as Thomas Emmett Patrick Radway. When Andrew was born later in the year, he was registered as Andrew Chatto Radway. The 1881 census found Chatto living at Dartmouth Park Hill Road, in the London Borough of Camden with Katharine, her son Thomas, the three children born to Katharine since the last census, her father, and a cousin. Thomas and Andrew had by then adopted the surname Chatto. Chatto always treated them as his sons and brought them into the business with him. Katharine's husband died on 27 December 1892, and in the first quarter of 1899 she re-married to Chatto at Holborn in London.
 When Hotten died suddenly in 1873, Chatto bought the firm from Hotten's widow for £25,000 with money from the Poet William Edward Windus (1828–1910) who became his partner in Chatto & Windus.: 11  While Windus provide the finance, he was not an active partner, living for some of the time on the Isle of Man. Windus probably knew Chatto from when Hotten had published his first volume of verse in 1871.
 At the time, there were five ways in which books might be published:
There were: 
 Conflicts arose between publishers and authors because of:
 The poet John Campbell (1777–1844) is said, during the height of the Napoleonic Wars to have induced a group of authors to drink to the health of Napoleon on the basis that he had once shot a publisher. Mark Twain told the Authors' Club in London in 1899 that It is of service to an author to have a lawyer, there is something so disagreeable in having a personal contact with a publisher. It is better to have a lawyer – and lose your case. Clearly relations between authors and their publishers were often fraught, and the risk of bad relations increased when publishers were less than honest in their dealings. Despite his speech, Chatto enjoyed very good relations with Mark Twain.: 14 
 When Chatto took over from Hotten, there were a number of legacy problems, resulting in part from Hotten's somewhat shady business practices. In particular, Hotten had alienated the poet Algernon Charles Swinburne by paying him little if any of the profits from the publication of his Poems and Ballads which had sold well. Chatto mended fences by sending Swinburne a cheque for £50 and a formal request to publish his work. Chatto subsequently published Swinburne's Bothwell.
 Peters contrasted Chatto who was not only an active and successful publisher, but an honest one, compared with Hotten, who was something of a rogue. Hotten had spent years in the United States and knew more about American literature than any other publisher in London. He made ruthless use of this knowledge to pirate works by American authors, as few had taken any steps to copyright their work in England.: 5 
 One of the Hotten's victims was Mark Twain, but Chatto managed to establish good relations with him and they became good friends.: 86  Chatto worked his charm with other authors also, and Robert Louis Stevenson said: If you don't know that you have a good author, I know I have a good publisher. Your fair, open and handsome dealings are a good point in my life, and do more for my crazy health than has yet been done by any doctor.: 14 
 In 1876, Chatto brought in Percy Spalding (third quarter of 1854 – 13 August 1930) to help him manage the firm. Spalding was much more of a financial manager than a literary man, so Chatto was left to decide editorial matters himself. 
 During the 1880s Chatto was determined to make Chatto & Windus the leading publisher of novels in London, and set out to dramatically increase their list.: 581  Chatto invested in expanding the list, buying the rights to the existing works of popular novelists such as Ouida, Wilkie Collins and others. He then reprinted them in cheap editions. He bought the remaining stock and copyrights of henry George Bohn's for £20,000. His strategy was to dramatically increase the firm's share of the novel market, and be the first choice for novelists. He certainly won the good will of writers.: 13  The purchase of Bohn's stock also expanded the range and type of books that he published.
 Chatto saw periodicals as another possible outlet for the firm's authors (and for the intellectual property that the firm had bought.) He bought The Belgravia and its associated annual. He published The Idler from 1892 to 1911, and he also handled The Gentleman's Magazine.
 Frank Arthur Swinnerton, who worked at the firm, recalls Chatto as: a gentle elderly man with a rolling walk, genially sweet in manner to every member of his staff, and much loved.
 The story of Rujub the Juggler illustrates two facets of Chatto's character, his support and encouragement for authors, the reason why Sutherland referred to the firm as the "hustlers" of the book trade.: 369  Chatto recognised and encouraged G. A. Henty's ability as a writer for adults. Chatto published four of Henty's eleven adult novels. Of these, Rujub, the Juggler was the biggest success, selling 11,000 copies, with most of these shortly after initial publication.Arnold said that the book had a period charm which he found surprising. and suggested that Henty's adult novels, which sold less than his juvenile titles, had been generally underrated.
 Rujub was first published in book form as a three-decker, or three-volume novel, without illustrations on 23 February 1893. The initial print run was for 500 copies. Chatto recognised that juveniles were also reading the Henty novels, and he published a single volume edition with eight illustrations by Stanley L. Wood in time for the Christmas market in 1893. Chatto had tremendous belief in Henty, and he ordered a print run of 3,000 for the illustrated edition (he had already printed 500 of the three-volume edition, and 2,000 of a single volume unillustrated colonial edition.): 238  Chatto's actions sailed close to the wind on two accounts:
 Katharine died on 11 October 1905. The 1911 census found Chatto living with his daughter Isobel and her family in Larkrise, Aldenham Road, Radlett, Hertfordshire. Chatto retired from publishing in 1912. He died the following year, on 15 March 1913, at his daughter's home. He was cremated at Golders Green on 18 March 1913. His estate was valued at just over £14,000, and probate was granted to his sons Thomas and Andrew.
 His daughter Isobel retained possession of his papers, including handwritten letters, manuscripts and a few books, and sold them at Sotheby's in 1916.: 10  In dying the year after he retired, Chatto was following the example of Windus, who retired from the firm in 1909 and died on 7 June of the following year.