Atsuko Ikeda (?? ??, Ikeda Atsuko, born 7 March 1931), formerly Atsuko, Princess Yori (???????, Yori-no-miya Atsuko Naishinno), is the widow of Takamasa Ikeda (?? ??, Ikeda Takamasa, 21 October 1926 – 21 July 2012) and fourth daughter of Emperor Showa and Empress Kojun.
As such, she is the older sister of Emperor Akihito.
She married Takamasa Ikeda on 10 October 1952.
As a result, she gave up her imperial title and left the Japanese Imperial Family, as required by law.
Later, she served as the most sacred priestess (saishu) of the Ise Grand Shrine between 1988 and 2017.