The Asian Openbill or Asian Openbill Stork, Anastomus oscitans, is a large wading bird in the stork family Ciconiidae. It is a resident breeder in tropical southern Asia from India and Sri Lanka east to Southeast Asia.

Asian Openbill Stork is a broad-winged soaring bird, which relies on moving between thermals of hot air for sustained flight. Like all storks, it flies with its neck outstretched. It is relatively small for a stork at 68 cm length. They breed near inland wetlands and build stick nest in trees, typically laying 2-6 eggs.

Breeding adults are all white except for the black wing flight feathers, red legs and dull yellow-grey bill. The mandibles do not meet except at the tip, and this gives rise to the species' name. Non-breeding adults have the white of the plumage replaced by off-white. Young birds have brown tinge to the plumage.