The Llibre Vermell de Montserrat (Catalan for "Red Book of Montserrat") is a collection of late medieval songs. The 14th century manuscript was located at the monastery of Montserrat outside Barcelona in Catalonia.

The songs, were written for the pilgrims to have something appropriately "chaste and pious" to sing. The songs are in Catalan, in Occitan and in Latin. While the collection was written near the end of the fourteenth century, much of the music in the collection appears from its style to originate earlier; the motet Imperayritz de la ciutat joyosa contains two different texts which can be sung simultaneously, a style that would have been old fashioned when the manuscript was compiled.

The songs have many of the characteristics of folk songs as well as hymns. Some are monophonic, while others are set in two to four parts of usually non-imitative polyphony. Some of the monodic songs can be sung as canons. The relative simplicity and strong melodies of the songs has given the music collected in the Red Book a lasting appeal, and these songs are some of the most frequently recorded pieces of early music.