Ly-Fontaine
| Ly-Fontaine | |
|---|---|
| The town hall of Ly-Fontaine | |
| Location of Ly-Fontaine | |
| Coordinates: 49°44′07″N 3°18′31″E / 49.7353°N 3.3086°E | |
| Country | France | 
| Region | Hauts-de-France | 
| Department | Aisne | 
| Arrondissement | Saint-Quentin | 
| Canton | Ribemont | 
| Government | |
| • Mayor (2020–2026) | Jérôme Vasseur | 
| Area 1 | 3.47 km2 (1.34 sq mi) | 
| Population  (2022) | 118 | 
| • Density | 34/km2 (88/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code | 02446 /02440 | 
| Elevation | 65–100 m (213–328 ft) (avg. 90 m or 300 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Ly-Fontaine (French pronunciation: [lifɔ̃tɛn]) is a commune in the Aisne department in Hauts-de-France in northern France.