Mineko Iwasaki (岩崎峰子 a.k.a. 岩崎究香, Iwasaki Mineko), born Masako Tanaka (田中政子, Tanaka Masako?, born on November 2, 1949 in Kyoto), was Japan's number one geiko (geisha) until her sudden retirement at the age of 29. Her story likely would have ended there, and she would have remained relatively unknown outside Japan, if not for her involvement with Arthur Golden and his book Memoirs of a Geisha.