Fukayasu (深安郡, Fukayasu-gun) was a district located in Hiroshima Prefecture, Japan.
On October 1, 1898, the district was formed by the mergers of both Fukatsu and Yasuna Districts.
On March 1, 2006, the last remaining town of Kannabe was merged into the expanded city of Fukuyama. Therefore, Fukayasu District was dissolved as a result of this merger. The entire district is now within the city of Fukuyama.