Martinus Nijhoff Publishers was an independent academic publishing company dating back to the nineteenth century, which is now an imprint of Brill Publishers. The name was changed to Brill–Nijhoff in 2013. Nijhoff's portfolio focuses on areas in public international law, human rights, on humanitarian law and increasingly on international relations. Its annual publication program consists of over 20 academic journals, 20 annuals, and some 120 new book titles. Its back-list comprises over 2,000 titles.
The company was founded in 1853 by Martinus Nijhoff [nl], grandfather of the Dutch poet of the same name and a seller of rare books. In the 1970s and 80s it became well known as an independent international law publisher. It was acquired by Wolters Kluwer in the 1970s and subsequently by Brill Publishers.