Glossip v. Chandler is a United States District Court for the Western District of Oklahoma case in which the plaintiffs challenged the State of Oklahoma's execution protocol. The initial lawsuit, Glossip v. Gross, rose to the United States Supreme Court in 2015 at the preliminary injunction stage and involved an earlier version of Oklahoma's lethal injection protocol. The case was reopened in the District Court in 2020 following an end to Oklahoma's moratorium on executions.