The 1971 Harco work-in was an action undertaken by workers at a steel plant in Campbelltown, New South Wales, Australia.
The work-in was the culmination of a protracted industrial dispute between the owners of Harco Steel and the workers at the Campbelltown site.
After a round of sackings in November 1971, the workers decided that strike action, which was common at the site, was no longer an effective tactic for confronting management.
Drawing inspiration from the factory occupations in France in 1968 as well as actions taken by the Upper Clyde Shipbuilders in Scotland earlier in 1971, the Harco workers adopted the tactic of the work-in.
The work-in ended when Harco obtained an order from the Supreme Court of New South Wales, which compelled the workers to leave the site.