Fukaya is a city located in Saitama Prefecture, Japan. As of 1 January 2021, it had an estimated population of 229,517 living in 142,803 households, with a population density of 1,023 persons per square kilometre. The city covers a total area of 138.37 square kilometres (53.42 square miles).
Fukaya is known for a local variety of Welsh onion, the Fukaya-negi (深谷ネギ), which is closely associated with the city.