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| Semuy | |
|---|---|
| The church in Semuy | |
| Coordinates: 49°29′18″N4°39′32″E / 49.4883°N 4.6589°E | |
| Country | France | 
| Region | Grand Est | 
| Department | Ardennes | 
| Arrondissement | Vouziers | 
| Canton | Attigny | 
| Intercommunality | Crêtes Préardennaises | 
| Government | |
| • Mayor (2020–2026) | Jean Frankart [1] | 
| Area 1 | 3.97 km2 (1.53 sq mi) | 
| Population  (2022) [2]  | 87 | 
| • Density | 22/km2 (57/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code |  08411 /08130 | 
| Elevation | 82–162 m (269–531 ft) (avg. 88 m or 289 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Semuy is a commune in the Ardennes department in northern France.
| Year | Pop. | ±% | 
|---|---|---|
| 1962 | 117 | — | 
| 1968 | 150 | +28.2% | 
| 1975 | 153 | +2.0% | 
| 1982 | 145 | −5.2% | 
| 1990 | 104 | −28.3% | 
| 1999 | 100 | −3.8% | 
| 2008 | 94 | −6.0% |