Demand Justice is a politically progressive American 501(c)(4) legal advocacy organization. It focuses on motivating left-leaning voters based on its goal of changing the composition of the American federal judiciary, as well as encouraging the United States Senate to confirm progressive nominees to judicial positions and to expand the United States Supreme Court. It was established in 2018 by Brian Fallon and Christopher Kang, originally as a project of the Sixteen Thirty Fund. In May 2021, when Demand Justice split off from the Sixteen Thirty Fund to become a separate organization, Axios described Demand Justice as the "tip of the progressive spear in battles over the makeup of the federal judiciary."