is a Japanese politician of the Komeito who served as a member of the House of Councillors from 2001 to 2024.
A native of Hiroshima Prefecture and graduate of Kyoto University, she joined the Ministry of Foreign Affairs in 1995, attending Istanbul University while in the ministry. In 2001, after leaving the ministry, she was elected to the House of Councillors for the first time.
Yamamoto left the House of Councillors to run from Osaka 16th district, in the 2024 House of Representatives election, to replace the retiring Kazuo Kitagawa, but was defeated by Masaki Kuroda of the Japan Innovation Party.