| Official Name: | Modrej |
| Pushpin Map: | Slovenia |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Slovenia |
| Subdivision Type: | Country |
| Subdivision Name: | Slovenia |
| Subdivision Type1: | Traditional region |
| Subdivision Name1: | Slovenian Littoral |
| Subdivision Type2: | Statistical region |
| Subdivision Name2: | Gorizia |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Tolmin |
| Area Total Km2: | 1.6 |
| Population As Of: | 2002 |
| Population Total: | 284 |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Coordinates: | 46.159°N 13.7499°W |
| Elevation M: | 172.6 |
| Footnotes: | [1] |
Modrej (in Slovenian pronounced as /mɔˈdɾeːi̯/; in older sources also Modreja[2]) is a settlement on the left bank of the Soča River, just north of Most na Soči, in the Municipality of Tolmin in the Littoral region of Slovenia.[3]
Modrej was attested in historical sources as Modrea in 1377. The name is believed to be derived from the nickname *Modrějь, formed from the anthroponym *Modrъ, based on the color adjective *modrъ 'blue'. It is unlikely that the name is derived from the adjective *mǫdrъ 'wise'.[4]