Hellingly Hospital was a large mental hospital in the village of Hellingly, east of Hailsham, in East Sussex, England. The hospital, also known as East Sussex County Asylum or just Hellingly, was opened in 1903. Its architect was GT Hine, one of the great asylum architects of the era.
The hospital boasted its own railway line, the Hellingly Hospital Railway, used principally for transport of coal. This branch line led from the main line to the boilerhouse.