Princess Chichibu (Yasuhito Shinnōhi Setsuko, née Setsuko Matsudaira) ( 9 September 1909 – 25 August 1995) was the wife of Prince Chichibu (Yasuhito) of Japan, the second son of Emperor Taishō and Empress Teimei. She was, therefore, a sister-in-law of Emperor Shōwa and an aunt of the present Emperor, Akihito. 