Juan Mencarini Pierotti (Alexandria, Egypt, 15 June, 1860 – Manila, Philippines, 29 April, 1929) was a Spanish mid-rank employee of the Chinese Maritime Customs Service between 1881 and 1912.
In parallel to his professional career, Mencarini actively participated in a number of cultural and scholarly initiatives, contributing to the development of philately and postal history of East Asia, and amateur photography around 1890