Kaihatsu-ryoshu (also pronounced as Kaihotsu-ryoshu) were those who owned the lands they developed as their territories in Shoen koryo sei (The System of Public Lands and Private Estates) in Japan.
開発領主（かいほつりょうしゅ/かいはつりょうしゅ）は、日本の荘園公領制において、田地を開発して領地を確保した者をいう。