The library, founded sometime between 548 and 565, is the oldest continuously operating library in the world.
The monastery library preserves the second largest collection of early codices and manuscripts in the world, outnumbered only by the Vatican Library.
It contains Greek, Georgian, Arabic, Coptic, Hebrew, Armenian, Aramaic and Caucasian Albanian texts.

In May 1844 and February 1859, Constantin von Tischendorf visited the monastery for research and discovered the Codex Sinaiticus, dating from the 4th Century, at the time the oldest almost completely preserved manuscript of the Bible.
The finding from 1859 left the monastery in the 19th century for Russia, in circumstances that had been long disputed.
But in 2003 Russian scholars discovered the donation act for the manuscript signed by the Council of Cairo Metochion and Archbishop Callistratus on 13 November 1869.
The monastery received 9000 rubles as a gift from Tsar Alexander II of Russia.
The Codex was sold by Stalin in 1933 to the British Museum and is now in the British Library, London, where it is on public display.
Prior to September 1, 2009, a previously unseen fragment of Codex Sinaiticus was discovered in the monastery's library.

In February 1892, Agnes Smith Lewis identified a palimpsest in St Catherine's library that became known as the Syriac Sinaiticus and is still in the Monastery's possession.
Agnes and her sister Margaret Dunlop Gibson returned with a team of scholars that included J. Rendel Harris, to photograph and transcribe the work in its entirety.
As the manuscript predates the Codex Sinaiticus, it became crucial in understanding the history of the New Testament.

The Monastery also has a copy of the Ashtiname of Muhammad, in which the Islamic prophet Muhammad is claimed to have bestowed his protection upon the monastery.

Additionally, the monastery houses a copy of Mok'c'evay K'art'lisay, a collection of supplementary books of the Kartlis Cxovreba, dating from the 9th century.

The most important manuscripts have since been filmed or digitized, and so are accessible to scholars.
With planning assistance from Ligatus, a research center of the University of the Arts London, the library was extensively renovated, reopening at the end of 2017.
The library, founded sometime between 548 and 565, is the oldest continuously operating library in the world.The monastery library preserves the second largest collection of early codices and manuscripts in the world, outnumbered only by the Vatican Library. It contains Greek, Georgian, Arabic, Coptic, Hebrew, Armenian, Aramaic and Caucasian Albanian texts.
In May 1844 and February 1859, Constantin von Tischendorf visited the monastery for research and discovered the Codex Sinaiticus, dating from the 4th Century, at the time the oldest almost completely preserved manuscript of the Bible. The finding from 1859 left the monastery in the 19th century for Russia, in circumstances that had been long disputed. But in 2003 Russian scholars discovered the donation act for the manuscript signed by the Council of Cairo Metochion and Archbishop Callistratus on 13 November 1869. The monastery received 9000 rubles as a gift from Tsar Alexander II of Russia. The Codex was sold by Stalin in 1933 to the British Museum and is now in the British Library, London, where it is on public display. Prior to September 1, 2009, a previously unseen fragment of Codex Sinaiticus was discovered in the monastery's library.
In February 1892, Agnes Smith Lewis identified a palimpsest in St Catherine's library that became known as the Syriac Sinaiticus and is still in the Monastery's possession. Agnes and her sister Margaret Dunlop Gibson returned with a team of scholars that included J. Rendel Harris, to photograph and transcribe the work in its entirety. As the manuscript predates the Codex Sinaiticus, it became crucial in understanding the history of the New Testament.
The Monastery also has a copy of the Ashtiname of Muhammad, in which the Islamic prophet Muhammad is claimed to have bestowed his protection upon the monastery.
Additionally, the monastery houses a copy of Mok'c'evay K'art'lisay, a collection of supplementary books of the Kartlis Cxovreba, dating from the 9th century.
The most important manuscripts have since been filmed or digitized, and so are accessible to scholars. With planning assistance from Ligatus, a research center of the University of the Arts London, the library was extensively renovated, reopening at the end of 2017.
Saint Catherine's Monastery