即时化生产技术（英语：Just in time，缩写为JIT），又称即时生产，是一种生产管理的方法学，源自于丰田生产方式。通过减少生产过程中的库存和相关的顺带成本，改善商业投资回报的管理战略。

为了满足及时制度的目标，生产流程依赖标记符号，或称看板管理，看板的作用是告诉工人，什幺时候该进行下一个流程。一般来说，看板也可以改为简单的视觉符号。如果运用得当，JIT可以帮助企业持续改进生产流程，提高生产性企业的投资回报率、质量、效率、员工参与度，以及产品流动速度。

Just-in-time (JIT) manufacturing, also known as just-in-time production or the Toyota production system (TPS), is a methodology aimed primarily at reducing flow times within production as well as response times from suppliers and to customers. Following its origin and development in Japan, largely in the 1960s and 1970s and particularly at Toyota, JIT migrated to Western industry in the 1980s, where its features were put into effect in many manufacturing companies—as is attested to in several books and compendia of case studies and articles from the 1980s.