中世纪拉丁语（英语：Medieval Latin）是在欧洲中世纪时期使用的拉丁语。它继承自后期拉丁语，从4-5世纪一直延续到约公元15世纪，才为文艺复兴拉丁语所取代。这一阶段拉丁语仍然是教会与学术界普遍使用的上层语言，同时通俗拉丁语也迅速地发生改变，与古典拉丁语的差异越来越大而渐渐变为各种罗曼语；从某些中世纪拉丁语作品可以很明显地看出当时从通俗拉丁语新生出的各罗曼语言对拉丁语文学的影响。

与古典拉丁语相比，中世纪拉丁语最主要的区别在于拼写上。原 ae 和 oe 二合元音变为 e/ę 和 e，同时有些词中的 e 二合元音化。希腊语地位的降低使拉丁语 y 和 i 的使用变得混乱，互换现象渐增，甚至出现在拉丁语固有词汇上。

Medieval Latin was the form of Latin used in the Middle Ages, primarily as a medium of scholarly exchange and as the liturgical language of Chalcedonian Christianity and the Roman Catholic Church, but also as a language of science, literature, law, and administration. Despite the clerical origin of many of its authors, medieval Latin should not be confused with Ecclesiastical Latin. There is no real consensus on the exact boundary where Late Latin ends and medieval Latin begins. Some scholarly surveys begin with the rise of early Ecclesiastical Latin in the middle of the 4th century, others around 500, and still others with the replacement of written Late Latin by written Romance languages starting around the year 900.