The Criminal Justice Workers Union or CJWU is a trade union that represents workers in the criminal justice sector in the United Kingdom.

Established on the 6th April 2020 by Mike Rolfe, former National Chair of the POA, and other key people in the criminal justice sector, the CJWU aims to offer a modern and alternative type of union to those readily in existence. The CJWU is a non-party political and non-TUC affiliated trade union.

As at the the 1st May 2020 the CJWU reportedly has in the region of 500 members.