| Kaoru Hatoyama | |
| Birth Date: | 21 November 1888 |
| Birth Place: | Yokohama, Kanagawa, Japan |
| Occupation: | educator and administrator |
| Order: | Spouse of the Prime Minister of Japan |
| Spouse: | Ichirō Hatoyama |
| Children: | Iichirō Hatoyama |
| Native Name Lang: | ja |
[1] was an educator and an administrator; she was the schoolmaster of Kyoritsu Women's University, which was founded by her mother-in-law, Haruko Hatoyama.[2] She is well known as the wife of Ichirō Hatoyama, who was the 52nd–54th Prime Minister of Japan, serving terms from December 10, 1954 through December 23, 1956. She was the mother of Iichirō Hatoyama, who was Japan's Foreign Minister from 1976 through 1977.
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.