- International Nannoplankton Association (INA) - Semi-formal association of scientists worldwide who have an interest in living or fossil nannoplankton - including coccolithophores, nannoliths, and other nannofossils such as silicoflagellates and calcispheres.
- International Research Group on Ostracoda (IRGO) - An interdisciplinary, international organization of research scientists studying living and fossil Ostracoda.
- The Micropalaeontological Society - Organization of micropaleontology workers in the UK. Formerly the British Micropalaeontological Society.
- The Pander Society - An international association of palaeontologists and stratigraphers with a common interest in the study of conodonts.
