The Record of a Pilgrimage to China in Search of the Law (入唐求法巡禮行記, nittō guhō junreikōki) is a four-volume diary written by Ennin, a Japanese Buddhist monk in China during the ninth century.

He wrote his diary while he went on a Buddhist pilgrimage to China for nine and a half years (838–847).

The books are translated into English as two volumes by Professor Edwin O. Reischauer of Harvard University under the title Ennin's Diary: The Record of a Pilgrimage to China in Search of the Law (Ronald Press, New York: 1955) and Ennin's Travels in T'ang China.

He did not write an evaluation of what he saw, but rather wrote about religious matters and Chinese life under the Tang dynasty.

His diary is a good source on the practice of popular Buddhism in China.