| Dionísio | |
| Settlement Type: | Municipality |
| Official Name: | Municipality of Dionísio |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | Region |
| Subdivision Type3: | Intermediate Region |
| Subdivision Type4: | Immediate Region |
| Subdivision Name: |  Brazil |
| Subdivision Name2: | Southeast |
| Subdivision Name3: | Ipatinga |
| Subdivision Name4: | Ipatinga |
| Established Title: | Founded |
| Established Date: | 27 December 1948 |
| Leader Title: | Mayor |
| Leader Name: | Francisco Castro Souza Filho |
| Leader Party: | MDB |
| Area Note: | [1] |
| Area Total Km2: | 339.375 |
| Elevation M: | 376 |
| Elevation Footnotes: | [2] |
| Population As Of: | 2021 |
| Population Total: | 7,493 |
| Population Density Km2: | auto |
| Population Demonym: | dionisiano |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Postal Code Type: | Postal Code |
| Postal Code: | 35984-000 to 35985-999 |
| Blank Name: | HDI (2010) |
| Blank Info: | 0.702 – high[3] |
Dionísio is a municipality in the state of Minas Gerais, Brazil. The city belongs to the mesoregion Metropolitana de Belo Horizonte and to the microregion of Itabira. As of 2020, the estimated population was 7,609.[4]
The municipality contains part of the Rio Doce State Park, created in 1944, the first state-level conservation unit in Minas Gerais.