| Olesa de Bonesvalls | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Province of Barcelona#Spain |
| Pushpin Map Caption: | Location in Catalonia |
| Coordinates: | 41.35°N 52°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Barcelona |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Alt Penedès |
| Leader Title: | Mayor |
| Leader Name: | Josep Ma. Tillo Bages (2015)[1] |
| Area Footnotes: | [2] |
| Area Total Km2: | 30.8 |
| Elevation M: | 265 |
| Population Density Km2: | auto |
| Population Demonym: | Olesà, olesana |
Olesa de Bonesvalls (in Catalan; Valencian pronounced as /uˈlɛzə ðə ˌβɔnəzˈβaʎs/) is a village and municipality in the Alt Penedès comarca in Catalonia, Spain. Until 1990 it was included in Garraf comarca.
It is located in the Garraf natural park, and includes its highest peak Montau, at 653m.[3] The land is stony karst with many caves, notably "Avenc de l'Esquerrà" at 348 m,[3] the deepest in Spain.
Its most notable building is Hospital de Cervelló, a fortified hostel complex for travellers dating from 1262, which has remained in good condition.[3]
Its economy is based mainly around agriculture, predominantly vineyards and orchards, and small local industry.
Its population was 1,735 in 2014.[1] The municipality is traversed by the road between the towns of Avinyonet del Penedès and Gavà.
In 1262 Olesa de Bonesvalls hosted a two-floor hospital whose architecture reproduced the Italian infirmaries of Fossanova, Viterbo and Casamari.Olesa was one of the oldest Spanish hospitals, along with Coll de Balaguer and Vich.[4]
| Pop 1900: | 643 |
| Pop 1930: | 513 |
| Pop 1950: | 389 |
| Pop 1970: | 372 |
| Pop 1986: | 329 |
| Pop 2007: | 1556 |
| Pop Latest: | 1735 |
| Latest Year: | 2014 |