| Ikuo Yamahana | |
| Native Name Lang: | ja |
| Office: | Member of the House of Representatives |
| Term Start: | October 23, 2017 |
| Constituency: | Tokyo PR |
| Term Start1: | August 30, 2009 |
| Term End1: | November 16, 2012 |
| Predecessor1: | Tatsuya Itō |
| Successor1: | Tatsuya Itō |
| Constituency1: | Tokyo-22nd |
| Term Start2: | June 26, 2000 |
| Term End2: | August 8, 2005 |
| Predecessor2: | Tatsuya Itō |
| Successor2: | Tatsuya Itō |
| Constituency2: | Tokyo-22nd |
| Birth Date: | 18 January 1967 |
| Birth Place: | Chōfu, Tokyo, Japan |
| Party: | Constitutional Democratic |
| Otherparty: | |
is a Japanese politician of the Constitutional Democratic Party of Japan, a member of House of Representatives in the Diet (national legislature). Yamahana served as Parliamentary Secretary for Foreign Affairs in the cabinet of Naoto Kan and as Deputy Justice Minister in the cabinet of Yoshihiko Noda.
Yamahana is the son of the former chairman of the Japanese Socialist Party, Sadao Yamahana. He started his political career as a secretary to then-Diet member and future Prime Minister Yukio Hatoyama.
Yamahana has only run in Tokyo's 22nd district for all his parliamentary career and represented it several times. He lost his seat twice in the LDP landslides of 2005 and 2012. After 2 unsuccessful runs to regain his seat in 2012 and 2014, Yamahana managed to return to the Diet in the 2017 election via the Tokyo proportional representation block. While losing the race for the Tokyo-22nd seat, he gained enough votes to be returned through the CDP's list in the Tokyo block.[1]