BlueLeaks, sometimes referred to by the X hashtag “#BlueLeaks”, refers to 269.21 gibibytes of internal U.S. law enforcement data obtained by the hacker collective Anonymous and released on June 19, 2020, by the activist group Distributed Denial of Secrets, which called it the "largest published hack of American law enforcement agencies".

Anonymous is a decentralized international activist and hacktivist collective and movement primarily known for its various cyberattacks against several governments, government institutions and government agencies, corporations and the Church of Scientology.