Okada Masaharu 岡田昌春 (zì Jūkoku 柔克), early-Meiji Japanese kanpō 漢方 physician. Staff physician of the imperially-chartered Hakusaidō 博濟堂 beriberi hospital in Tokyo from its founding by official charter in the 8th month of Meiji 11 (1878). Co-author with Kiyokawa Gendō 清川玄道 of KR3eh054 Hakusaidō Kakke gairon 博濟堂腳氣概論 (1879), the institutional clinical manual that summarizes the kanpō response to the early-Meiji beriberi epidemic. He signs the joint preface of Meiji 12 / 5 (May 1879). No detailed biographical material located in standard kanpō prosopography; not in CBDB.