Rentarō Taki (滝 廉太郎, Taki Rentarō, 24 August 1879 – 29 June 1903) was a Japanese pianist and composer of the Meiji era. Taki was born in Tokyo, but moved to many places during his childhood owing to his father's job. He graduated from the Tokyo Music School in 1901. One of his famous pieces is "Kōjō no Tsuki" (Moon Over the Ruined Castle), which was included in the songbook for junior high school students, along with the "Hakone-Hachiri" (箱根八里). "Hana" (花, "Flower") is also a well-known song.