The Community Security Trust (CST) is a British charity whose stated mission is to provide safety, security, and advice to the Jewish community in the UK. It provides advice, training, representation and research.

The Community Security Trust grew out of the Community Security Organisation, which became independent of the Board of Deputies of British Jews in 1986. It was registered as a charity in 1994 and has a mission to provide safety, security, and advice to the Jewish community in the UK. The CST's mission statement says, "To work at all times for the physical protection of British Jews." The CST began recording antisemitic incidents in 1984.

The group's founding chairman is the British businessman and long-time supporter of Jewish charities, Gerald Ronson.

The deputy chairman is Lloyd Dorfman. The chief executive of the CST is Mark Gardner, who was previously the Director of Communications. Dave Rich is the Director of Policy at CST.

The CST has four offices, over 90 employees and a network of several thousand volunteers from all parts of the Jewish community, who work closely with the police, including for joint patrols, advisory, and training.

The CST provides security advice and training for Jewish schools, synagogues and communal organisations and gives assistance to those bodies that are affected by antisemitism. The CST also assists and supports individual members of the Jewish community who have been affected by antisemitism and antisemitic incidents. Included in its work countering antisemitism is monitoring criticism of Israel.

It advises and represents the Jewish community on matters of antisemitism, terrorism and security and works with police, government and international bodies. All this work is provided at no charge.

In 2012, the CST provided the model for a new anti-Islamophobia project, Tell MAMA (run by interfaith organisation Faith Matters), with which it now works closely.