The South African National Defence Union (SANDU) is a South African trade union for SANDF members.

It is not affiliated to any trade union federation as state by COSATU.

Military trade Unions in South Africa are by law not allowed to affiliate.

In April 2016, after the Constitutional Court found that President Zuma had failed to uphold the country's constitution, and Zuma responded with only an apology, the union backed mass action to remove the president.

This article related to a South African trade union is a stub.