Minaminasu (南那須町, Minaminasu-machi) was a town located in Nasu District, Tochigi Prefecture, Japan.

As of 2003, the town had an estimated population of 13,128 and a density of 160.96 persons per km². The total area was 81.56 km².

On October 1, 2005, Minaminasu, along with the town of Karasuyama (also from Nasu District), was merged to create the city of Nasukarasuyama and no longer exists as an independent municipality.