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Sefer haYashar ( Hebrew ספר הישר) means "Book of the Upright One", but Jashar is generally left untranslated into English and so Sefer haYashar is often rendered as Book of Jasher.

• Sefer haYashar, a collection of sayings of the sages from the Amoraim period in Rabbi Zerahiah's Sefer Hayasher
• Sefer haYashar, a commentary on the Pentateuch by the 12th-century Abraham ibn Ezra
• Sefer haYashar, by the Kabbalist and philosopher Abraham Abulafia
• Sefer haYashar (Rabbeinu Tam), 12th-century treatise on Jewish ritual and ethics
• Sefer haYashar of Zerahiah the Greek, a moral treatise of the 13th century
• Sefer haYashar (midrash), a 16th-century book of Jewish legends

• Book of Jasher (biblical references)
• Book of Jasher (Pseudo-Jasher), an 18th-century forgery by a London printer, Jacob Ilive
• Book of Jashar, fictional translation of the supposed Book of Jasher mentioned in 2 Samuel by Benjamin Rosenbaum (born 1969)

This disambiguation page lists articles associated with the title Sefer haYashar.
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