The lesser fish eagle (Haliaeetus humilis) is a species of Haliaeetus found in the Indian subcontinent, primarily in the foothills of the Himalayas, and south-east Asia. There are records from Gujarat, Central India and in more recent times from the Kaveri river valley in southern India, although the south Indian records are now thought to come from an isolated population, disjunct from the species' normal range. Some taxonomic authorities place this species in the monotypic genus Ichthyophaga. Others place it in the genus Haliaeetus.
The lesser fish eagle is a medium-sized bird of prey that is primarily gray-brown in colour with broad, blunt wings and coarse featherless legs. They are smaller than the similar Haliaeetus ichthyaetus (grey-headed fish eagle) and may often get confused with the similar species. The lesser fish eagle has a brown breast with white thighs and belly. They have a short, rounded tail with a long neck and a small head. Juvenile lesser fish eagles are similar in appearance to adults, although they have brown eyes whereas an adult has yellow. Adults have a wingspan reaching 1.2 m.