Hermanus Koekkoek, known as The Younger (8 December 1836, Amsterdam - May 1909, London) was a Dutch marine artist, and art dealer.
In addition to painting, he operated an art dealership; specializing in works by his family members.
The great popularity of his uncle Barend, in England, owes much to his promotional efforts.
His own work focused on sea, river, and beach views, in a Realistic style with Romantic elements; much like most of his relatives.
In his later years, he emphasized the realistic, dramatic elements, and was influenced by the Hague School.