改良主义（Reformism）是相对激进革命而言的修正主义政策。

改良主义主张在现有架构和基础上渐进演变、逐步进步，反对激烈变革，反对疾风骤雨式的推翻现有架构重新构造新架构的革命。

Reformism is the belief that gradual changes through and within existing institutions can ultimately change a society's fundamental economic system and political structures. This hypothesis of social change grew out of opposition to revolutionary socialism, which contends that some form of revolution is necessary for fundamental structural changes to occur.