This document discusses re3data.org, a global registry of research data repositories. It was created to help researchers, funders, publishers, and institutions find appropriate repositories to store and share research data. The registry launched in 2012 and currently lists over 300 research data repositories from around the world. Each repository is described using a standardized metadata schema with 37 criteria covering aspects like access, file types, certification, and geographic coverage. The goal of the registry is to promote a culture of open data sharing and increased access to research findings. It aims to help address the challenges of the growing number and heterogeneity of research data repositories.