The azure jay (Cyanocorax caeruleus) (Brazilian Portuguese: Gralha-azul, meaning blue jackdaw) is a passeriform bird of the crow family, Corvidae.

It is found in the Atlantic Forest, especially with Araucaria angustifolia, in south-eastern Brazil (São Paulo to Rio Grande do Sul), far eastern Paraguay and far north-eastern Argentina.

The azure jay has a total length of approximately 40 cm (16 in) and it weighs about 270 g (9.5 oz), and is the largest South American corvid.

Its plumage is intensely blue with a contrasting black head and upper chest.

Like other corvids, azure jays are highly intelligent.