The Koekkoek family is a Dutch family which produced a large number of painters, primarily during the 19th century. With a total of eighteen painters across five generations bearing the name, the Koekkoek family is considered to be one of the largest families of painters in the world. The second-generation Barend Cornelis Koekkoek was the most influential of the family: in general, he was one of the "main exponents of landscape art" in the 19th century, and in particular, his influence through the school he founded in the city of Kleve led to the recognition of Kleve Romanticism as a specific and oft-imitated style. Since 1960, his former Kleve residence now houses the B.C. Koekkoek-Haus museum, which is dedicated to works of the family. Artists of the Koekkoek name and others in the extended family were mostly oil painters of landscapes and marine art, but included lithographers, sculpturists, and others as well.