亚欧语系（英语：Eurasiatic languages）为一个认为其语言分类范围扩及亚欧大陆北部地区的总语系，然而对于这项假设绝大部分主流的历史语言学学者并未给予大力支持。各个专家对于亚欧语系的底下分法也有许多讲法，但通常都会包括有阿尔泰语系、楚科奇－堪察加语系、爱斯基摩－阿留申语系、印欧语系和乌拉尔语系（不过约瑟·哈罗德·格林伯格则使用有争议性的乌拉尔－尤卡吉尔语系作为替代）。有时候则会同时提及到在附近地区的南高加索语系和达罗毗荼语系，或者是被视为孤立语言的伊特拉斯坎语和尼夫赫语，有些说法则认为亚欧语系包括有同样大范围、但亦遭到主流学者批评的诺斯特拉语系。

Eurasiatic is a proposed language macrofamily that would include many language families historically spoken in northern, western, and southern Eurasia.

The idea of a Eurasiatic superfamily dates back more than 100 years. Joseph Greenberg's proposal, dating to the 1990s, is the most widely discussed version. In 2013, Mark Pagel and three colleagues published what they believe to be statistical evidence for a Eurasiatic language family.