Arida District (有田郡 Arida-gun) is a district located in Wakayama Prefecture, Japan.
As of September 1, 2008, the district has an estimated population of 50,095 and a density of 114 persons/km². The total area is 437.88 km².
Coordinates: 34°02′17″N 135°11′39″E / 34.038170°N 135.194133°E