Guijing 龜經 is a text on prognostication written before the early Ming period 明 (1368-1644).
The oldest text of this name is listed in the bibliographical chapter Suishu jingji zhi 隋書•經籍志. The bibliographical chapter in the dynastic history Xintangshu 新唐書 lists several books called Guijing, one written by Liu Yanxun 柳彥詢 and one by Liu Shilong 柳世隆 (442-491), each with a length of 3 juan, and four with a length of 1 juan, written by Liu Baozhen 劉寶真, Wang Hongli 王弘禮, Zhuang Daoming 莊道名, and Sun Simiao 孫思邈 (581-682), respectively. Whether the transmitted Guijing corresponds to one of these text cannot by said.
The text is included in the series Shuofu 說郛, Wuchao xiaoshuo 五朝小說, Wuchao xiaoshuo daguan 五朝小說大觀 and Yihai zhuchen 藝海珠塵.