Reform (Latin: reformo) means the improvement or amendment of what is wrong, corrupt, unsatisfactory, etc. The use of the word in this way emerges in the late 18th century and is believed to originate from Christopher Wyvill's Association movement which identified “Parliamentary Reform” as its primary aim. Reform is generally regarded as antithetical to revolution.

Developing countries may carry out a wide range of reforms to improve their living standards, often with support from international financial institutions and aid agencies. This can include reforms to macroeconomic policy, the civil service, and public financial management.

In the United States, rotation in office or term limits would, by contrast, be more revolutionary, in altering basic political connections between incumbents and constituents.