| Official Name: | Mrčna Sela |
| Native Name: | Mrčna sela |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location in Slovenia |
| Subdivision Type: | Country |
| Subdivision Name: | Slovenia |
| Subdivision Type1: | Traditional region |
| Subdivision Name1: | Styria |
| Subdivision Type2: | Statistical region |
| Subdivision Name2: | Lower Sava |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Krško |
| Area Total Km2: | 3.82 |
| Population As Of: | 2002 |
| Population Total: | 152 |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 46.0547°N 15.5151°W |
| Elevation M: | 554.6 |
| Postal Code: | 8282 |
| Footnotes: | [1] |
Mrčna Sela (in Slovenian pronounced as /ˈməɾtʃna ˈseːla/ or in Slovenian pronounced as /ˈməɾtʃna ˈsɛːla/; Slovenian: Mrčna sela, German: Mertschnasela[2]) is a dispersed settlement in the hills northeast of Senovo in the Municipality of Krško in eastern Slovenia. The area is part of the traditional region of Styria. It is now included with the rest of the municipality in the Lower Sava Statistical Region.[3]
There is a small empty chapel-shrine in the settlement. It was built in the late 19th century.[4]