| Caldueñu | |
| Settlement Type: | Parish |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Asturias |
| Subdivision Type2: | Province |
| Subdivision Name2: | Asturias |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Llanes |
Caldueñu (Spanish: Caldueño) is one of 28 parishes (administrative divisions) in the municipality of Llanes in eastern Asturias, in northern Spain. It is just south of the Mazucu mountain and the village of El Mazuco (where the Battle of El Mazuco occurred in 1937 during the Spanish Civil War).