Ashigarashimo District (足柄下郡 Ashigarashimo-gun?) is a district of Japan located in western Kanagawa Prefecture, Japan. Most of the mountainous district is sparsely populated, and is part of the Fuji-Hakone-Izu National Park. The majority of the area of the city of Odawara was formerly part of Ashigarashimo District.
As of 2009, the district had an estimated population of 48,713 and a density of 346 persons per km². The total area was 140.73 km².
Ashigarashimo District was one of the ancient subdivisions of Sagami Province, per the Nara period Ritsuryō system, under the name as Ashinoshimo District (足下郡 Ashinoshimo-gun?). The area was under control of the late Hōjō clan in the Sengoku period, and part of Odawara Domain during the Edo period. Following disasters caused by eruptions of nearby Mount Fuji, a portion also came to be held as tenryō territory administered by the Tokugawa shogunate.