Kōza District (高座郡 Kōza-gun?) is a district located in central Kanagawa Prefecture, Japan. It currently consists of only one town, Samukawa. The entire cities of Chigasaki, Fujisawa, Yamato, Ayase, Ebina, Zama; and parts of the city of Sagamihara, were formerly part of Kōza District.
As of 2009, the district has an estimated population of 47,812 and a density of 3,560 persons per km². The total area is 13.42 km².
Kōza District was one of the ancient subdivisions of Sagami Province, extending from Sagami Bay north to the border of Musashi Province between the Sagami River and the Sakai River. It was mentioned in the Nihon Shoki records of 675 AD in the Nara period as Takakura District (高倉郡 Takakura-gun?). The provincial capital of Sagami Province and its kokubunji were located within Kōza District, although its exact location is today unknown.