UCL Pathology Collections is an irreplaceable collection with important clinical teaching and research significance, consisting of some 6,000 specimens and objects. It comprises a series of sub-collections which originate from the incorporation of several London teaching and research hospitals, primarily the medical schools of UCL and the Royal Free Hospital, but also includes the Great Ormond Street Hospital.

The core collection includes fluid-preserved human pathology specimens alongside skeletal material, foreign bodies, wax models, plaster casts and histopathology slides. With the exception of some historic specimens, most of the collections date back to the 20th Century.