| Official Name: | Martinjak |
| Settlement Type: | Village |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | Location in Slovenia |
| Subdivision Type: | Country |
| Subdivision Name: | Slovenia |
| Subdivision Type1: | Traditional region |
| Subdivision Name1: | Inner Carniola |
| Subdivision Type2: | Statistical region |
| Subdivision Name2: | Littoral–Inner Carniola |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Cerknica |
| Area Total Km2: | 4.22 |
| Population As Of: | 2020 |
| Population Total: | 297 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 45.7761°N 14.402°W |
| Elevation M: | 565.5 |
| Footnotes: | [1] |
Martinjak (pronounced as /sl/, de|Martinsbach[2]) is a village southeast of Cerknica, below Mount Slivnica in the Inner Carniola region of Slovenia.[3]
The local church in the settlement is dedicated to Saint Vitus and belongs to the Parish of Cerknica. It was first mentioned in written sources dating to 1581. The wooden ceiling in the church dates to 1621. The current belfry was built between 1936 and 1938.[4]