| Mýrdalshreppur | |
| Settlement Type: | Municipality |
| Mapsize: | 250px |
| Pushpin Map: | Iceland |
| Coordinates: | 63.4194°N -19.0097°W |
| Subdivision Type: | Country |
| Subdivision Name: | Iceland |
| Subdivision Type1: | Region |
| Subdivision Name1: | Southern Region |
| Subdivision Type2: | Constituency |
| Subdivision Name2: | South Constituency |
| Leader Title1: | Manager |
| Leader Name1: | Ásgeir Magnússon |
| Unit Pref: | Metric |
| Area Total Km2: | 755 |
| Population Total: | 489 |
| Population Density Km2: | 0.65 |
| Postal Code Type: | Postal code(s) |
| Postal Code: | 870, 871 |
| Code1 Name: | Municipal number |
| Code1 Info: | 8508 |
Mýrdalshreppur (pronounced as /is/) is a municipality located in southern Iceland. The main village is Vík.