| Masanhoewon-gu | |
| Native Name Lang: | ko |
| Settlement Type: | Non-autonomous District |
| Translit Lang1: | Korean |
| Translit Lang1 Type1: | Hangul |
| Translit Lang1 Info1: | 마산회원구 |
| Translit Lang1 Type2: | Hanja |
| Translit Lang1 Info2: | 馬山會原區 |
| Translit Lang1 Info3: | Masanhoewon-gu |
| Translit Lang1 Info4: | Masanhoewŏn-gu |
| Mapsize: | 280px |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Population Blank1 Title: | Dialect |
| Population Blank1: | Gyeongnam |
| Area Total Km2: | 90.58 |
| Population As Of: | 2010 |
| Population Total: | 225556 |
| Population Density Km2: | 2460.28 |
| Parts Type: | Administrative divisions |
Masanhoewon-gu is a district in the City of Changwon, South Korea.