Isshiki Naotarō 一色直太郎 (Chinese: Yīsè Zhítàiláng, fl. 1910s–30s), Japanese pharmacognosist and commercial pharmacist of the Taishō and early-Shōwa periods. Author of Wa-Kanyaku ryōhi kanbetsuhō oyobi chōseihō 和漢藥良否鑑別法及調製法 (“Method for Distinguishing Good from Poor in Sino-Japanese Drugs, with Preparation Methods”, c. 1918) and its revised second edition Hànyào liáng liè jiànbié fǎ 漢藥良劣鑑別法 (KR3ec084, 1929 — printed 昭和四年六月). The revised edition adds 170 substances over the original and is one of the principal commercial-pharmacognostic manuals of the early-Shōwa Japanese pharmaceutical trade. Japanese pharmacognosist; not in CBDB.