Minamiaiki (南相木村, Minamiaiki-mura) is a village located in Nagano Prefecture, Japan.

[2] Per Japanese census data,[3] the population of Minamiaiki has declined by more than half since its peak around 1950.

The area of present-day Minamiaiki was part of ancient Shinano Province, and was mentioned in Muromachi period records.

The area was part of the tenryō territories under the direct administration of the Tokugawa shogunate during the Edo period.

The present village of Minamiaiki was created with the establishment of the modern municipalities system on April 1, 1889.