Sera (世羅郡, Sera-gun) is a district located in Hiroshima Prefecture, Japan.

As of 2020, the district has an estimated population of 15,125 and a density of 54.38 persons per km². The total area is 278.1 km².^[1]

Towns and villages

• Sera

Merger

• On October 1, 2004 all three towns in the district merged into the single expanded town of Sera. The other two former towns were Kōzan and Seranishi.