Jan Joost van Cossiau (c.1660–1732) was a Flemish landscape painter and engraver who was born near Breda. He spent most of his career in Frankfurt am Main. His landscapes usually include people, and also often buildings and cattle. They are in the “Italian style” and generally resemble those of Gaspard Dughet (1613–1675). Cossiau worked for Lothar Franz von Schönborn at his electoral court, as well as at his Schloss Weißenstein (castle). He was also director of the electoral gallery at Pommersfelden, where he established the final directory of paintings, after the first survey by Johann Rudolph Bys. In order to extend his gallery, Lothar Franz sent his two gallery directors often to the Netherlands and Italy. Jan Joost van Cossiau died in Mainz in 1732.
- Bauereisen, Hildegard, Der kurmainzische Hofmaler Jan Joost van Cossiau, ein spätbarocker Landschaftsmaler, New York, P. Lang, 1986.
- Bott, Katharina, Jan Joost Van Cossiau: Delitiae Imaginum, Oder Wohl-Erlaubte Gemahlde Und Bilder-Lust Die Gemaldesammlung Des Lothar Franz Von Schonborn in Schloss Gaibach/Unterfranken Die Gemaldekatalog Von Jan Joost Van Cossiau Aus Dem Jahre 1721, Weimar, VDG, 2000.
- Bryan, Michael, Robert Edmund Graves, Walter Armstrong, Dictionary of Painters and Engravers, G. Bell and Sons, 1886, 315.
- Thieme, Ulrich and Felix Becker, Allgemeines Lexikon der bildenden Künstler von der Antike bis zur Gegenwart, Reprint of 1907 edition, Leipzig, Veb E.A. Seemann Verlag, 1980-1986.
- Bryan, 1886, p. 315
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