| Official Name: | Lusaghbyur |
| Native Name: | Լուսաղբյուր |
| Pushpin Map: | Armenia |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Name: | Armenia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Lori |
| Population As Of: | 2001 |
| Population Total: | 998 |
| Utc Offset: | +4 |
| Coordinates: | 40.8653°N 44.0306°W |
| Elevation M: | 1,800 |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Spitak |
| Native Name Lang: | hy |
| Other Name: | Aghbulagh |
Lusaghbyur (Armenian: Լուսաղբյուր) is a town in the Spitak Municipality within the Lori Province of Armenia.
The village was previously known as Aghbulagh .[1]
During the Turkish–Armenian War in late 1920, The Turkish army massacred 1,186 inhabitants of the village.
The population of the village since 1831 is as follows:
| Year | Population | Note | |
|---|---|---|---|
| 1831 | 152 | 100% Armenian | |
| 1873 | 768 | ||
| 1886 | 967 | ||
| 1897 | 1,210 | 1,172 Armenians, 14 Orthodox, 24 others; 645 men | |
| 1904 | 1,317 | ||
| 1914 | 1,637 | Mainly Armenian | |
| 1916 | 1,618 | ||
| 1919 | 2,077 | Mainly Armenian | |
| 1922 | 589 | 100% Armenian | |
| 1926 | 915 | 100% Armenian; 467 men | |
| 1931 | 1,217 | 100% Armenian | |
| 1939 | 1,350 | ||
| 1959 | 1,210 | ||
| 1979 | 1,056 | ||
| 2001 | 998 | ||
| 2004 | 1,110 |