Johan Barthold Jongkind was a Dutch painter and printmaker. He painted marine landscapes in a free manner and is regarded as a forerunner of Impressionism.

Jongkind was born in the town of Lattrop in the Overijssel province of the Netherlands near the border with Germany. Trained at the art academy in The Hague under Andreas Schelfhout, in 1846 he moved to Montparnasse in Paris, France where he studied under Eugène Isabey and François-Édouard Picot. Two years later, the Paris Salon accepted his work for its exhibition, and he received acclaim from critic Charles Baudelaire and later on from Émile Zola. He was to experience little success, however, and he suffered bouts of depression complicated by alcoholism.

Jongkind returned to live in Rotterdam in 1855, and remained there until 1860. Back in Paris, in 1861 he rented a studio on the rue de Chevreuse in Montparnasse where some of his paintings began to show glimpses of the Impressionist style to come. In 1862 he met in Normandy, in the famous ferme Saint-Siméon in Honfleur, with some of his artist friends, such as Alfred Sisley, Eugène Boudin, and the young Claude Monet, to all of whom Jongkind served as a mentor. Monet later referred to him as "...a quiet man with such a talent that is beyond words" and credited the "definitive education" of his own eye to Jongkind. In 1863 Jongkind exhibited at the first Salon des Refusés. He was invited to participate in the first exhibition of the Impressionist group in 1874, but he declined.

In 1878, Jongkind and his companion Joséphine Fesser moved to live in the small town of La Côte-Saint-André near Grenoble in the Isère département in the southeast of France. He died in 1891 in Saint-Égrève, in the same département. He is buried in the cemetery of La Côte-Saint-André. A street is named after him in the neighborhood of streets named after 19th- and 20th-century Dutch painters in Overtoomse Veld-Noord, Amsterdam.