This document provides the dataset for the histological reporting of cutaneous malignant melanoma. It replaces the first edition of the previous dataset of 2002. Although the data items remain largely unchanged, in some instances their current usage has revised implications for treatment, management and prognosis of melanomas. The meticulous diagnosis and reporting of cutaneous malignant melanoma is important because histological parameters play a major role in defining patient treatment. Similarly, recording of pathological parameters in the dataset has direct implications for the prognosis of individual patients.