| Hiromi Iwanaga | |
| Native Name Lang: | ja |
| Office: | Member of the House of Councillors |
| Term Start: | November 1995 |
| Term End: | 25 July 2010 |
| Constituency: | Saga at-large |
| Predecessor: | Seijiro Otsuka |
| Successor: | Takamaro Fukuoka |
| Office1: | Member of the Saga Prefectural Assembly |
| Term Start1: | 1975 |
| Term End1: | 1995 |
| Birth Date: | 1942 6, df=y |
| Birth Place: | Arita, Saga, Japan |
| Alma Mater: | Chuo University |
| Party: | Liberal Democratic |
is a Japanese politician of the Liberal Democratic Party, a member of the House of Councillors in the Diet (national legislature). A native of Arita, Saga and dropout of Chuo University, he had served in the assembly of Saga Prefecture for six terms since 1975 and was elected to the House of Councillors for the first time in 1995.