| Hamaoka | |
| Native Name Lang: | ja |
| Settlement Type: | Former municipality |
| Seal Type: | Emblem |
| Pushpin Map: | Japan |
| Pushpin Map Caption: | Location in Japan |
| Coordinates: | 34.6271°N 138.1486°W |
| Subdivision Type: | Country |
| Subdivision Name: | Japan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Chūbu (Tōkai) |
| Subdivision Type2: | Prefecture |
| Subdivision Name2: | Shizuoka Prefecture |
| Subdivision Type3: | District |
| Subdivision Name3: | Ogasa |
| Extinct Title: | Merged |
| Extinct Date: | April 1, 2004 (now part of Omaezaki) |
| Leader Title: | Mayor |
| Leader Title1: | Vice Mayor |
| Unit Pref: | Metric |
| Area Total Km2: | 53.57 |
| Population Total: | 24,774 |
| Population As Of: | March 1, 2004 |
| Population Density Km2: | 462.5 |
| Timezone1: | JST |
| Utc Offset1: | +09:00 |
| Blank Name Sec1: | City hall address |
was a town located in Ogasa District, Shizuoka Prefecture, Japan.
As of March 1, 2004, the town had an estimated population of 24,774 and a density of 462.5 persons per km2. The total area was 53.57 km2.
Hamaoka was founded as a town in 1955 through the merger of Ikeshinden Town with Sakura, Kitaki, Asahina and Niino Villages.
On April 1, 2004, Hamaoka, along with the former town of Omaezaki (from Haibara District), was merged to create the city of Omaezaki.[1]
Hamaoka is noted as the site of the Hamaoka Nuclear Power Plant operated by Chubu Electric Power.