Welcome to the Gathering for Open Science Hardware (GOSH) Community Ambassador Handbook. This booklet describes how community ambassadors can and should represent GOSH. This handbook was put together over the 2023 - 2024 calendar year thanks to the hard work of the GOSH community. Please refer to this Handbook when acting as an ambassador of the GOSH Community. We intend for this guide to assist not only those who are part of the GOSH ambassador program, but anyone who wishes to bring open science hardware and its applications into their organisations and communities. Together, we can make open science hardware ubiquitous! Authors and contributions This document was written by Likam Kyanzaire with editorial support from Brianna Johns and designed by La Propia Agencia. It is licensed under CC-BY 4.0. This work was made possible by support from the Alfred P. Sloan Foundation to the Open Science Hardware Foundation. For more information, please visit https://openhardware.science/