The insect collection is the largest collection curated in Naturalis. It contains some 18 million individual specimens.
In terms of quality and quantity the collection of Coleoptera is one of the best beetle collections in the world. It contains many type specimens. Systematically and geographically some of the highlights are the Cetoniids, the Scarabeoidea and beetles from the Indo-Australian region (Ritsema & Van Vollehoven). Further highlights are the Hymenoptera from Southeast Asia (e.g. van der Vecht and Lieftinck) with the Braconidae being one of the largest in the world, the Diptera (van Doesburg and Bonne-Webster), Lepidoptera (Indonesia), Microlepidoptera (Diakonoff) and Odonata and other families. (Lieftinck and van Doesburg), again one of the larger collections in the world.