The Association of Supervisory Staffs, Executives and Technicians (ASSET), was a British trade union, chiefly representing supervisors in the metal working and transport industries. It was formed from the National Foremen's Association, founded in 1918.
In 1929 the National Foremen's Association merged with the Amalgamated Managers' and Foremen's Association, which was active in the mining industry. In 1942 the union changed its name to the Association of Supervisory Staff and Engineering Technicians and in 1946 it changed again to the Association of Supervisory Staff, Executives and Technicians.
In 1969 ASSET merged with the AScW (the Association of Scientific Workers) to form ASTMS (The Association of Scientific, Technical and Managerial Staffs).
ASSET's final General Secretary was Clive Jenkins.