《米制公约》（法语：Convention du Mètre，英语：Metre Convention），为法、俄、德等17个国家于1875年5月20日签署的一项国际公约。依该公约成立了旨在协调国际计量和协调米制发展的协会，同时也设立了监督协会运行的相关组织。最初，它仅涉及质量和长度单位，但在1921年的第6届国际计量大会上，对其进行了修订，其任务扩展到所有物理量的测量。在1960年的第11届国际计量大会上，它创建的单位系统被定为“国际单位制”（SI）。

依米制公约设立了3个国际组织：

该公约的成员国被限定为法国的邦交国，但是1999年，为那些希望参与CIPM互认协议（CIPM-MRA）进程的校准和计量方面而不加入国际计量局的国家设立了附属成员的类别。

Metre Convention (French:Convention du Mètre), also known as the Treaty of the Metre, is an international treaty that was signed in Paris on 20 May 1875 by representatives of 17 nations. The treaty set up an institute for the purpose of coordinating international metrology and for coordinating the development of the metric system. The treaty also set up associated organizations to oversee the running of the institute. Initially it was only concerned with the units of mass and length but, in 1921, at the 6th meeting of the General Conference on Weights and Measures (CGPM), it was revised and its mandate extended to cover all physical measurements. In 1960, at the 11th meetings of the CGPM, the system of units it had established was overhauled and relaunched as the "International System of Units" (SI).