《联合国气候变化框架公约》（英语：United Nations Framework Convention on Climate Change，UNFCCC或FCCC），于1992年5月在纽约联合国总部通过的一个国际公约，1992年6月在巴西里约热内卢召开的有世界各国政府首脑参加的联合国环境与发展会议期间开放签署。1994年3月21日，该公约生效。

本公约第二条规定，“本公约以及缔约方会议可能通过的任何相关法律文书的最终目标是：根据本公约的各项有关规定，将大气中温室气体的浓度稳定在防止气候系统受到危险的人为干扰的水平上。这一水平应当在足以使生态系统能够自然地适应气候变化、确保粮食生产免受威胁并使经济发展能够可持续地进行的时间范围内实现。”

The United Nations Framework Convention on Climate Change (UNFCCC) is an international environmental treaty negotiated at the Earth Summit in Rio de Janeiro from 3 to 14 June 1992, then entered into force on 21 March 1994. The UNFCCC objective is to "stabilize greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system". The framework set no binding limits on greenhouse gas emissions for individual countries and contains no enforcement mechanisms. Instead, the framework outlines how specific international treaties (called "protocols" or "Agreements") may be negotiated to set binding limits on greenhouse gases.