Ryusaku Tsunoda (?? ??, Tsunoda Ryusaku, 8 September 1877 - 29 November 1964) is known as the "father of Japanese studies" at Columbia University.
He was directly responsible for developing the Japanese language and literature collection at Columbia's library.
Prominent among the former-students who credit his influence as formative is Donald Keene, who has himself become over time the current Dean of Japanese studies in the United States.