The Global Long-Term Agricultural Experiment Network (GLTEN) is a network of long-term agricultural experiments. The GLTEN was launched in May 2018 with the aim of establishing and supporting a collaborative network within the international agricultural science community. The aim of the GLTEN metadata portal is to increase the visibility of long-term agricultural experiments and provide new opportunities for collaborations and data re-use. The GLTEN Metadata portal uses a defined metadata schema to provide consistent descriptions of over 200 LTEs, representing diverse and contrasting climate regions and environments, as well as multiple crop systems and land management schemes.