was a city located in Saitama Prefecture, Japan.
As of April 1, 2011, the city had an estimated population of 61,781, with 26,902 households, and a population density of 9,932.64 per km<sup>2</sup>. The total area was 6.22 km<sup>2</sup>, the second smallest among all cities in Japan.
The city was founded on March 1, 1967.
On October 11, 2011, Hatogaya was merged into the expanded city of Kawaguchi.