Kaisō District, Wakayama

Kaisō (海草郡, Kaisō-gun) is a district located in Wakayama Prefecture, Japan.

As of September 1, 2008, the district has an estimated population of 10,988 and a density of 85.6 inhabitants per square kilometre (222/sq mi). The total area is 128.31 square kilometres (49.54 sq mi).