An hórreo () is a typical granary from the northwest of the Iberian Peninsula (Asturias, Galicia, where it might be called a Galician granary, and Northern Portugal), built in wood or stone, raised from the ground (to keep rodents and water out) by pillars ( in Asturian and Cantabrian, in Galician, in Portuguese, in Basque) ending in flat staddle stones (vira-ratos in Galician, mueles or tornarratos in Asturian, or zubiluzea in Basque) to prevent access by rodents. Ventilation is allowed by the slits in its walls.
In some areas, hórreos are known as horriu, , (Asturian), (Leonese), (Cantabrian), hórreo, paneira, canastro, piorno, cabazo (Galician), , , , (Portuguese), , , (Basque). The term ultimately derives from Latin (âÂÂbarleyâÂÂ).
Hórreos are mainly found in the Northwest of Spain (Asturias and Galicia) and Northern Portugal. There are two main types of hórreo, rectangular-shaped, the more extended, usually found in Galicia and coastal areas of Asturias; and square-shaped hórreos from Asturias, León, western Cantabria, and eastern Galicia.
The oldest document containing an image of an hórreo is the Cantigas de Santa Maria by Alfonso X "El Sabio" (song CLXXXVII) from the 13th century. In this depiction, three rectangular hórreos of gothic style are illustrated.
There are several types of Asturian hórreo, according to the characteristics of the roof (thatched, tiled, slate, pitched or double pitched), the materials used for the pillars or the decoration. The oldest still standing date from the 15th century, and even nowadays they are built ex novo. There are an estimated 18,000 hórreos and paneras in Asturias, some are poorly preserved but there is a growing awareness from owners and authorities to maintain them in good shape.
The longest hórreo in Galicia is located in Carnota, A Coruña, and is long.
Other similar granary structures include Asturian paneras (basically, big hórreos with more than four pillars), cabaceiras (Galician round basketwork hórreo), trojes or in Castile or silos.
<Gallery> File:Horreo Lluanco.png|alt=Hórreo in Lluanco, Asturias, Spain|Panera in Luanco, Asturias File:Horrero.JPG|A Galician hórreo. File:Carnota 084.JPG|Hórreo of Carnota, Galicia. File:Horreo en Cosgaya, Cantabria.jpg|Hórreo from Cosgaya, Cantabria. File:Hórreo tipo asturiano, O Piornedo.jpg|Hórreo from Piornedo, Galicia. File:Hórreo da reitoral de Bealo, Boiro.jpg|Corn cobs inside an hórreo, Boiro, Galicia. File:Horreodefonseca.jpg|Hórreo from Siero, Asturias. File:Pegollo horreo eiros.jpg|Stone pillar (pegollu) standing on a footing stone (pilpayu) and capped with a staddle stone (muela). Image:Staddle stones, Somerset Rural Life Museum.jpg|Building sitting on staddle stones, at the Somerset Rural Life Museum, similar to Iberian hórreos. File:Hórreo Ortoño.jpg|Decorated granary in Ames. File:Hórreo e prensa para facer sidra. Pazo da Hermida. Dodro.jpg|Brick granary in Dodro. File:Hórreos de Combarro.jpg|Granary set in . File:Soajo - Espigueiros.JPG|Stone granary in Portuguese . File:Hórreo de Carnota.jpg|Alvenary granary over pillars in . File:Horreo de Lira, Carnota.jpg|Alvenary granary over pillars and slab in . File:Hórreo do Araño.jpg|Alvenary granary over barn in Rianxo. File:Oroso hórreo.jpg|Mixed granary over masonry strains in Oroso. File:Ponteulla Vedra Galicia 12.jpg|Wooden granary over masonry strains in Vedra. File:Estayes l'horru.svg|Parts of the Asturian horru </Gallery>
Similar granaries were common throughout Atlantic Europe: Northwest Iberian Peninsula, France, the British Isles, Scandinavia.
There are espigueiros or canastros in northern Portugal (the most famous concentration is located in Soajo).
French Savoy has its regard, also encountered in the Swiss Valais (raccard) and the Italian Aosta Valley (rascard). Norway has its stabbur, Sweden its härbre or more precisely stolphärbre or . Hambars are found in the Balkans, and serender in northern Turkey.
Similar buildings (barns) on staddle stones are found in Southern England.
<Gallery> File:Soajo - Espigueiros.JPG|Espigueiros from Arcos de Valdevez, Portugal File:Raccard.JPG|Raccards in Valais, Switzerland File:Bautahaugen Samlinger, Bergsrud.jpg|Stabbur originally from Bergsrud in Sør-Aurdal Municipality, Norway later relocated to the Bautahaugen Samlinger Image:Ambar 1.jpg|Ambar from 1888 in Banovci, Croatia during winter Image:Ambar 2.jpg|Ambar from 1888 in Banovci, Croatia during summer </Gallery>