| Mariana | |
| Settlement Type: | Municipality |
| Official Name: | Municipality of Mariana |
| Mapsize: | 250px |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location in Brazil |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Type2: | State |
| Subdivision Name: |  Brazil |
| Subdivision Name1: | Southeast |
| Leader Title: | Mayor |
| Leader Name: | Duarte Eustáquio Júnior (PPS)[1] |
| Established Title: | Founded |
| Established Date: | July 16, 1696 |
| Area Total Km2: | 1194.208 |
| Population As Of: | 2021 |
| Population Total: | 61,830 |
| Population Density Km2: | 45.40 |
| Population Footnotes: | [2] |
| Population Demonym: | Marianense[3] |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Coordinates: | -20.3783°N -43.3997°W |
| Elevation M: | 899 |
| Postal Code Type: | CEP postal code |
| Postal Code: | 35420-000 |
| Area Code Type: | Area code |
| Area Code: | +55 31 |
| Blank Name: | HDI (2010) |
| Blank Info: | 0.742 – high[4] |
Mariana is the oldest city in the state of Minas Gerais, Brazil. It is a tourist city, founded on July 16, 1696, and retains the characteristics of a baroque city, with its churches, buildings and museums. It was the first capital of Minas Gerais.
Other historical cities in Minas Gerais are Ouro Preto, São João del-Rei, Diamantina, Tiradentes, Congonhas and Sabará.
It has an area of .[5]
The municipality contains a very small part of the of Serra do Gandarela National Park, created in 2014.
In 2015, it suffered a major dam disaster.