| Constance of Aragon | |
| Infanta of Aragon | |
| Succession: | Queen Consort of Sicily |
| Reign: | 11 April 1361 – 18 July 1363 |
| Spouse: | Federico III of Sicily (m. 1361 – 1363) |
| Issue: | Maria I of Sicily |
| House: | Barcelona |
| Father: | Pedro IV of Aragon |
| Mother: | Maria of Navarre |
| Birth Date: | 1343 |
| Birth Place: | Royal Monastery of Santa Maria de Poblet, Kingdom of Aragon |
| Death Place: | Catania, Kingdom of Sicily |
| Burial Place: | Cathedral of St Agatha, Catania, Kingdom of Sicily |
Constance of Aragon (Catalan; Valencian: Constança d'Aragó; 1343 – 2/18 July 1363), was the first Queen consort of Frederick III the Simple. She was an infanta of Aragon, the eldest child of Peter IV of Aragon[1] and his first wife Maria of Navarre. Her father unsuccessfully proposed her as heir to the throne in early 1347, in the absence of a male heir.
On 8 February 1351 at Perpignan, a betrothal between Constance and Louis I of Anjou, son of King John II of France, was performed. However, the marriage never took place.
On 11 April 1361 at Catania, Constance married King Frederick III of Sicily. They had one daughter, Maria (2 July 1363 - 25 March 1401), who succeeded her father as reigning Queen of Sicily[2] in 1377 and married Martin of Aragon.
In 1363 Constance died in Catania, Sicily, either from the plague, or following childbirth complications. She is buried in the Cathedral of Catania.