Kazuko Yokoo

Kazuko Yokoo (横尾和子, b. April 141941) is a justice of the Supreme Court of Japan. She is the second woman in history to serve in that role.

She attended International Christian University and became a bureaucrat in the Ministry of Health and Welfare after graduation. She was appointed as head of Japan's social insurance system in 1994, and as ambassador to the Republic of Ireland in 1998. In 2001, she was appointed to the Supreme Court.

She is one of the youngest people to be appointed to the Supreme Court in recent history, and is therefore the longest-serving justice on the court as of 2007 due to the mandatory retirement age of 70.