Jacques Joseph Tissot (French: [ʒɑk ʒozɛf tiso]; 15 October 1836 – 8 August 1902), better known as James Tissot (UK: /ˈtɪsoʊ/ TISS-oh, US: /tiːˈsoʊ/ tee-SOH), was a French painter, illustrator, and caricaturist. He was born to a drapery merchant and a milliner and decided to pursue a career in art at a young age, coming to incorporate elements of realism, early Impressionism, and academic art into his work. He is best known for a variety of genre paintings of contemporary European high society produced during the peak of his career, which focused on the people and women's fashion of the Belle Époque and Victorian England, but he would also explore many medieval, biblical, and Japoniste subjects throughout his life. His career included work as a caricaturist for Vanity Fair under the pseudonym of Coïdé.

Tissot served in the Franco-Prussian War on the side of France and later the Paris Commune. In 1871 he moved to London, where he found further success as an artist and began a relationship with Irishwoman Kathleen Newton, who lived with him as a close companion and muse until her death in 1882. Tissot maintained close relations with the Impressionist movement for much of his life, including James Abbott Whistler and friend and protégé Edgar Degas. He was awarded the French Legion of Honor in 1894.

Jacques Tissot was born in the city of Nantes in France and spent his early childhood there. His father, Marcel Théodore Tissot, was a successful drapery merchant. His mother, Marie Durand, assisted her husband in the family business and designed hats. A devout Catholic, Tissot's mother instilled pious devotion in the future artist from a very young age. Tissot's youth spent in Nantes likely contributed to his frequent depiction of shipping vessels and boats in his later works. The involvement of his parents in the fashion industry is believed to have been an influence on his painting style, as he depicted women's clothing in fine detail. By the time Tissot was 17, he knew he wanted to pursue painting as a career. His father opposed this, preferring his son to follow a business profession, but the young Tissot gained his mother's support for his chosen vocation. Around this time, he began using the given name of James as an Anglicisation, becoming commonly known as James Tissot by 1854; he may have adopted it because of his increasing interest in everything English.

In 1856 or 1857, Tissot travelled to Paris to pursue an education in art. While staying with a friend of his mother, painter Jules-Élie Delaunay, Tissot enrolled at the Ecole des Beaux-Arts to study in the studios of Hippolyte Flandrin and Louis Lamothe; Both were successful Lyonnaise painters who moved to Paris to study under Jean-Auguste-Dominique Ingres. Around this time, Tissot also made the acquaintance of the American James McNeill Whistler, and French painters Edgar Degas (who had also been a student of Lamothe and a friend of Delaunay), and Édouard Manet.

In 1859, Tissot exhibited in the Paris Salon for the first time. He showed five paintings of scenes from the Middle Ages, many depicting scenes from Goethe's Faust. These works show the influence in his work of the Belgian painter Henri Leys, whom Tissot had met in Antwerp earlier that same year. Other influences include the works of the German painters Peter von Cornelius and Moritz Retzsch. After Tissot had first exhibited at the Salon and before he had been awarded a medal, the French government paid 5,000 francs for his depiction of The Meeting of Faust and Marguerite in 1860. The painting went on to be exhibited at the Salon the following year, together with a portrait and several other paintings.

Émile Péreire supplied Tissot's painting Walk in the Snow for the 1862 international exhibition in London; the next year three paintings by Tissot were displayed at the gallery of art dealer Ernest Gambart in London.

Sometime after 1862, Tissot began to shift focus from his early medievalist styles to instead match English tastes for narrative paintings of Victorian life and society. He quickly gained success among British audiences and was lauded for his photorealistic, narrative style of art that combined meticulous training with an impressionistic use of color and value. Tissot came to maintain a wide social sphere in light of his success and lifestyle, including Oscar Wilde, James Abbott Whistler, and Edgar Degas. Degas shared many of his cultural interests as Tissot's mentee, notably producing a portrait of Tissot in which he is sitting below a Japanese screen hanging on the wall.

Tissot led a tumultuous life outside of painting, fighting in the Franco-Prussian War as part of the improvised defence of Paris; First by joining two companies of the Garde Nationale and later as part of the radical Paris Commune, though he is believed to have only joined the latter to protect his own belongings rather than for shared ideology. Either because of the radical political associations of serving as a Communard or because of better opportunities, he left Paris for London in 1871. Seymour Haden helped him to learn etching techniques during this period.