Leptoptilos robustus (from "Lepto [Greek: thin, slender]" + "ptilo [Greek: soft feather]" and "robustus [Latin: strong]) is an extinct species of large bodied Leptoptilini stork that existed during the Pleistocene epoch in the Quaternary period, which lasted about 11,000 to 2.5 million years ago. It stood at about 1.8 metres (5.9 ft) tall and weighed up to an estimated 16 kilograms (35 lb). The species was discovered on the island of Flores, Indonesia, and the majority of the discoveries were concentrated in Liang Bua cave located slightly north of Ruten in the East Nusa Tenggara province.