Katō (加東郡, Katō-gun) was a district located in Hyōgo Prefecture, Japan.
As of 2008, the district had an estimated population of 40,334 and a density of 257.03 persons per km2. The total area was 157.49 km2.
平成18年3月20日に社町、滝野町、東条町の3町が合併し、「加東市」が発足してから、市制10周年を迎えました。