This document is the result of a year of work and collaboration by the Trans Metadata Collective (TMDC; https://transmetadatacollective.org/), a group of dozens of cataloguers, librarians, archivists, scholars, and information professionals with a concerted interest in improving the description and classification of trans and gender diverse people in GLAMS (Galleries, Libraries, Archives, Museums and Special Collections). The Collective’s primary goal was to develop a set of best practices for the description, cataloguing, and classification of information resources as well as the creation of metadata about trans and gender diverse people, including authors and other creators