thumb|Map of Sakai, Nagano
was a village located in Higashichikuma District, Nagano Prefecture, Japan.
Population
As of 2003, the village had an estimated population of 1,588 and a density of 42.45 persons per km<sup>2</sup>. The total area was 37.41 km<sup>2</sup>.
History
On October 11, 2005, Sakai, along with the villages of Honjō and Sakakita (all from Higashichikuma District), were merged to create the village of Chikuhoku.