The Least Seedsnipe (Thinocorus rumicivorus) is a species of bird in the Thinocoridae family. It breeds in Argentina, Bolivia, Chile, and Peru and has been recorded in Ecuador, the Falkland Islands, Uruguay and possibly Brazil. The range of the Least Seedsnipe is estimated to be about 1,300,000 km2. Its natural habitats are temperate grassland, subtropical or tropical high-altitude grassland, and pastureland.