The Amalgamated Society of Engineers (ASE) was a major British trade union, representing factory workers and mechanics.
The history of the union can be traced back to the formation of the Journeymen Steam Engine, Machine Makers' and Millwrights' Friendly Society, in 1826, popularly known as the "Old Mechanics".
These unions, which also included the Ironfounders, Builders, and Carpenters' societies, rejected Chartism and the ideas of Robert Owen in favour of a more moderate policy based on 'prudence', 'respectability' and steady growth.
Great importance was attached to the question of finance, as substantial funds would not only provide maintenance for members involved in strike action, but also help to deter the employers from attacking the organisation.
Since its members were skilled and relatively highly paid, it was possible for the ASE to charge contributions of one shilling a week and to build up a fund of unprecedented proportions.
Many of them left in 1905 to join the Industrial Workers of the World, and the ASE decided in 1920 to transfer the remaining branches to the International Association of Machinists.