| Official Name: | Mar Azul |
| Pushpin Map: | Argentina |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Argentina |
| Pushpin Mapsize: | 200 |
| Pushpin Mapsize1: | 200 |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Buenos Aires |
| Subdivision Type2: | Partido |
| Subdivision Name2: | Villa Gesell |
| Population Total: | 569 |
| Coordinates: | -37.25°N -112°W |
| Elevation M: | 0 |
| Postal Code Type: | CPA Base |
| Postal Code: | B 7165 |
| Area Code: | +54 2255 |
Mar Azul is a small coastal settlement in Buenos Aires Province, Argentina. It is located in Villa Gesell Partido.
The settlement has a recorded population of 569 after the 2001 census, an 800% increase from 92 residents recorded after the 1991 census. Mar Azul has been annexed by the city of Villa Gesell.