Toshikazu Kase (加瀬 俊一, Kase Toshikazu; January 12, 1903 – May 21, 2004) was a Japanese civil servant and career diplomat. During World War II he was a high-ranking Foreign Ministry official. Hideaki Kase (1936–2022) was his son and Yoko Ono is his niece.
Source: “Toshikazu Kase”, English Wikipedia (CC BY-SA 4.0), excerpt