A slowdown (UK: go-slow) is an industrial action in which employees perform their duties but seek to reduce productivity or efficiency in their performance of these duties. A slowdown may be used as either a prelude or an alternative to a strike, as it is seen as less disruptive as well as less risky and costly for workers and their union. Striking workers usually go unpaid and risk being replaced, so a slowdown is seen as a way to put pressure on management while avoiding these outcomes. Other times slowdowns are accompanied by acts of sabotage on the part of workers to provide further disruption.

Nonetheless, workers participating in a slowdown are often punished, sometimes by firing and other times by law.