William Heysham Overend was a British marine artist and book illustrator who died prematurely in 1898.

William Heysham Overend was born on 5 October 1851 in Coatham, County Durham. Many sources state that his birthplace was Coatham, North Yorkshire near Middlesbrough. However, it seems more likely that his birthplace was Coatham Mundeville near Darlington.

His parents were James Overend (1821 – 2 November 1875), a flax spinner, born in Bentham, Yorkshire, and Martha née Hodgson (1824–1886), born in Hawkshead, Lancashire and the daughter of Braithwaite Hodgson, a wealthy landowner. The family lived in Priestgate, Darlington in the 1850s, but the 1861 census found them living at No, 2, Buccleuch Terrace, Hackney. By now, his father was a railway contractor.

Overend was educated at both Charterhouse School, where he only spent one year, and Bruce Castle School, where he remained until 1867. He was already showing early promise as Athol states that a sketch drawn by him at age 14, of a boarding party, would not have disgraced a student of the Royal Academy.

After leaving Bruce Castle School in the summer of 1857, Overend spend the next three years in the studio of Davis Cooper, son of Abraham Cooper RA. Here he went through the traditional course of art training, but continued to teach himself after leaving the studio. By 1871, he was a lodger, with the profession of artist (painter), together with Edward Overend, an unemployed Naval Engineer, in a small lodging house at 14 Clapton Terrace in Hackney, London.

Overend found it difficult at first to earn his living as a painter. His first successful submission to the Royal Academy was in 1872, and by 1880 he had exhibited twice with both the Royal Academy and the Society of British Artists. He continued to exhibit throughout his life, including at the Royal Academy, The Society of British Artists, the Royal Society of Painters in Oils, Liverpool, Glasgow, 1891 Naval Exhibition, and the 1883 World Columbian Exhibition.

Beginning as a painter, Overend moved into illustration. His connection with the Illustrated London News began in 1875 when he illustrated the Sir George Nares Artic expedition. For the next decade at least he was second only to Richard Caton Woodville as an illustrator for the paper. Overend also illustrated articles in The English Illustrated Magazine from 1891, Good Words from 1894, The Rambler from 1897, The Pall Mall Magazine, and the juvenile periodicals The Boy's Own Paper, and Chums from 1892, Overend also drew for The Illustrated Naval and Military Magazine, The Graphic, The Magazine of Art, and The Leisure Hour, London Society, St. Nicholas, and The Penny Illustrated Paper.

Overend's work was characterised by thoroughness. He maintained a stock of uniforms and weapons to serve as models for his drawings.

Overend was not just an artist, but an engraver. He records his occupation as steel engraver in the 1891 census. Newbolt notes that Overend probably carved the woodcuts for some of his illustrations, including for the six illustrations for G. A. Henty's A Chapter of Adventures.

Overend was elected a member of the Royal Institute of Painters in Oils on 27 January 1886. He was elected to the Council of the Navy Records Society in 1897. These two elections illustrate that his work was recognised not only by his artistic peers, but also by naval historians.

One of the strangest things about Overend is that he was a landsman, bred and born. He was miles from the coast, and had no relatives in either the merchant or naval service, yet his knowledge of past and present ships of war was matched by few sailors.

An August morning with Farragut; the Battle of Mobile Bay, 5 August 1864 is Overend's greatest work. The painting is enormous, being 3.048m (10 feet) wide by 1.969m (6 feet 5½ inches) high. It was painted in oils on canvas. Overend was commissioned by the Fine Art Society, an art gallery with showrooms in London and Glasgow, to produce a painting of a naval battle of the American Civil War. Kirkpatrick states that Overend was commissioned to paint Admiral Porter's conquest of New Orleans, and that the Farragut painting was additional. Kirkpatrick further states that the Farragut painting was painted while Overend was in the United States. However, Mayhew, who was a colleague of Overend's, makes no reference to the New Orleans painting, but states that from the first the commission was for what became the Farragut painting, he also states that the work was painted in Overend's Ormond Street studio in London.

Overend attacked the commission with his usual thoroughness. He left Liverpool for New York, arriving on the RMS Scythia on 4 October 1882. Knowing virtually no-one in the United States, but supplied with letters of introduction from the US Minister in London to the navy department at Washington, he went vigorously to work to collect his material. He visited the ship to sketch it. He collected naval uniforms, plans, arms, sketches, photographs, and studies. He interviewed survivors and enlisted the aid of Farragut's son, a Naval Captain, in his researches. Overend painted the officers and men from photographs taken after their arrival in New Orleans.

Overend returned to London with all the reference material he had collected to paint the picture. While in the United States Overend visited the 1883 Columbian Exhibition in Chicago where he exhibited a painting, Victory!: the Prize Crew taking possession, and some drawings.

The title of the work, and even the work itself, were both drawn from a vivid account of the battle of Mobile harbour by J. C. Kinney which was published in the June 1881 edition of Scribner's Magazine under the title An August Morning with Farragut. The incident described in the painting can briefly be described as follows. On the morning of 4 August 1864 Admiral Farragut's fleet, consisting of 14 ships and four monitors forced their way past the forts protecting Mobile Bay. The Admiral was about his flagship, the Hartford, a wooden hulled combined steam-and-sail ship. On 5 August 1864, the steam-powered ironclad Confederate ram CSS Tennessee, the flagship of the small Confederate fleet of four ships, attempted to ram the Hartford. It struck the Hartford a glancing blow on the port bow and then the ships ground past each other, the moment captured in the painting. In the painting, the observer seems to be at the port taffrail amidships on the Hartford, looking backwards towards the wheel and quarter-deck. The Tenessessee is grinding along the port side of the Hartford moving deeper into the scene. Farragut is shown standing on the quarter-rail holding onto the rigging, where tradition holds that the lashed himself on in case he were hit.

Overend returned from America and painted the work in his painting in 1883 in his Ormonde Street Studio. The Pall Mall Gazette of 1 November 1883 announced that the Fine Art Society would shortly be selling prints of the painting. The painting was on display in the premises of James S Earle and Sons, in Philadelphia in September 1884. In 1885 G. A. R. Dorchester were selling prints of the painting for 25 cents each.

The painting was valued at $4,000 when it was displayed in at an art dealer's in Buffalo, New York in May 1885. It was also displayed in other towns throughout the US including Cedar Rapids, Iowa, and finally in Hartford, Connecticutin January 1886. Hartford was the town for which Farragut's flagship was named.

By February the local newspaper, the Hartford Courant, had already begun a campaign to purchase the picture for Hartford, with the intent to donate the painting the free picture gallery in the Wadsworth Atheneum. The newspaper estimated the painting was worth $10,000 but could be obtained for about one third of this price. Three subscribers had already contributed $100 each to the fund. The subscription was successful as the painting was hung in the Wadsworth Athenaeum in c. May 1886.

Overend died at his residence, 17 Southampton Street (now named Conway Street), Fitzroy Square, in London, on the evening of Friday, 18 March 1898. The death certificate gave a number of causes of death including Locomotor ataxia which is often a symptom of tertiary syphilis. Other causes included Catarrh of the Bowels (diarrhoea), and Albuminuria, an indicator of kidney disease. His doctor stated that he had been suffering for ten years. The columnist on the Penny Illustrated Paper noted that Overend had never been strong since he injured his leg, and that he had complained of Catarrh of the Bowels the last time he had dropped a drawing off at the Illustrated London News. He was buried on Wednesday, 23 March 1898 in Tottenham Cemetery. His estate was valued at over £3,000, a very respectable sum for the period.