| Official Name: | Ptghni Պտղնի |
| Native Name: | Պտղնի |
| Pushpin Map: | Armenia |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Name: | Armenia |
| Subdivision Type1: | Marz (Province) |
| Subdivision Name1: | Kotayk |
| Leader Title: | Mayor |
| Leader Name: | Arakel Virabyan |
| Established Title: | Founded |
| Established Date: | 1831 |
| Area Total Km2: | 6.22 |
| Population As Of: | 2011 |
| Population Total: | 1,595[1] |
| Population Density Km2: | auto |
| Timezone: | |
| Utc Offset Dst: | +5 |
| Coordinates: | 40.2567°N 44.585°W |
| Elevation M: | 1350 |
Ptghni (hy|Պտղնի), is a village located in the Kotayk Province of Armenia along the left bank of the Hrazdan River. It was founded in 1831 in the vicinity of an abandoned dwelling. The village has a school, kindergarten, house of culture, and a library. The local economy is dependent on agriculture and local inhabitants primarily grow grapes, melons, gourds, and breed cattle. Within the village are the remains of fortress walls and Ptghavank of the 6th to 7th-century.[2] [3]