The Cairo Geniza, alternatively spelled Genizah, is a collection of some 400,000 Jewish manuscript fragments and Fatimid administrative documents that were kept in the genizah or storeroom of the Ben Ezra Synagogue in Fustat or Old Cairo, Egypt. These manuscripts span the entire period of Middle-Eastern, North African, and Andalusian Jewish history between the 6th and 19th centuries CE, and comprise the largest and most diverse collection of medieval manuscripts in the world.

A genizah is a storage area in a Jewish synagogue or cemetery designated for the temporary storage of worn-out Hebrew-language books and papers on religious topics prior to proper cemetery burial.