The Red Book of the Exchequer (Liber Rubeus or Liber ruber Scaccarii) is a 13th-century manuscript compilation of precedents and office memoranda of the English Exchequer. It contains additional entries and annotations down to the 18th century. It is now held at The National Archives, Kew, London. It takes its name from its red leather binding, which distinguishes it from the related and contemporary, but smaller, .