Lidth's jay (Garrulus lidthi), also known as the Amami jay, is a passerine bird in the family Corvidae native to the Ryukyu Islands, Japan. it is slightly larger than its close relative the Eurasian jay, with a proportionately stouter bill and also a longer tail. It has no discernible crest, with the head feathers a velvety black, the shoulders and back a deep purplish blue and all other parts a rich chestnut purple.
This jay has a very restricted distribution occurring only on the southern Japanese islands of Amami Ōshima and Kakeromajima. It may have also been present on Tokunoshima. It occurs in subtropical evergreen broadleaf forests as well as in coniferous, deciduous, and mixed woodlands both in the lowlands and on the mountains.