The Japanese wagtail (Motacilla grandis) is a species of bird in the pipit and wagtail family Motacillidae. It is native to Japan and Korea.
The Japanese wagtail is about 20 cm long. The sexes look similar; they have white underparts and black upperparts, throats, and backs. Their supercilia are also white. They have black beaks and dark grey legs and feet. The plumage of a juvenile is greyer than that of an adult.