A rime dictionary, rhyme dictionary, or rime book is an ancient type of Chinese dictionary that collates characters by tone and rhyme, instead of by radical.

The most important rime dictionary tradition began with the Qieyun (601), which aimed to reconcile the literary reading traditions and poetic practice of north and south China.

This work became very popular during the Tang dynasty, and went through a series of revisions and expansions, of which the most famous is the Guangyun (1007–1008).

The Jiyun (literally "Collected Rimes") is a Chinese rime dictionary published in 1037 during the Song Dynasty.

The chief editor Ding Du and others expanded and revised the Guangyun.

It is possible, according to Teng and Biggerstaff (1971:147), that Sima Guang completed the text in 1067.

The Jiyun has 53,525 character entries (ibid), approximately twice as many as the Guangyun, and likewise has two hundred and six rime groups.