Saturday is the seventh (sixth in some countries) day of the week, between Friday and Sunday. It is the only day of the week to retain its Roman origin in English, named after the Roman god of time Saturn, calling it dies Saturni, "Saturn's Day". Many of the other days of the week adopted names of Saxon gods in Northern Europe, in Anglo-Saxon. There also exists a possibility that the modern English form derives from Anglo-Saxon 'Saeter daegv', as Saeter "Saturn" was regarded as a correlary of Loki by Northern Germanic peoples. ^*

In India, Saturday is Shanivar. It is based on Shani, the Vedic God manifested in the planet Saturn.

By tradition derived from ancient Jews, Saturday is the last day of the week. That convention remains universally standard in the United States. In Europe, for several decades, many people have considered Saturday the sixth (penultimate) day of the week, and Sunday the last. This current European labour-orientated convention has been formalized by ISO 8601. However, the three monotheist religions are in agreement that Saturday is the last day of the week. In Islamic countries, Fridays are holidays, however they are considered as the sixth days of the week.