| Valdunquillo | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain |
| Pushpin Map Caption: | Location in Spain |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Valladolid |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Tierra de Campos |
| Subdivision Type4: | Judicial district |
| Subdivision Name4: | Medina de Rioseco |
| Coordinates: | 42.0333°N -5.7219°W |
| Elevation M: | 741 |
| Area Total Km2: | 30.8 |
| Established Title: | Founded |
| Established Date: | See text |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Blank Info Sec1: | Spanish |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 47672 |
| Area Code Type: | Dialing code |
| Area Code: | 983 |
| Leader Title: | Alcalde |
| Leader Name: | Máximo Baza Pastor (2007) |
Valdunquillo is a municipality located in the province of Valladolid, Castile and León, Spain. According to the 2004 census (INE), the municipality has a population of 179 inhabitants. The town's residents traditionally call themselves "lechugeros," a testament to the fact that the town had a good reputation for cultivating lettuce. Valdunquillo is adjacent to the towns La Unión de Campos, Villalogán, Bolaños de Campos, Valderas, Medina de Rioseco, and Villavicencio de los Caballeros.
Valdunquillo has been occupied by Christians, Jews, and Muslims. However, archaeological evidence shows that the area was likely first inhabited by the Vaccaei. The first written reference of the town appears in a document, dating to the year 1126, in which the Countess Doña Mayor donates to the monastery of Sahagún. In another donation, dating to the year 1192, it is referred to as "Valle de Junquello," perhaps the origin of its present-day name. On 5 March 1368 King Enrique II ceded the town to Alvar Pérez Osorio. The Osorio family formed much of the town's history, and promoted its convent. On 1 May 1623 King Philip IV of Spain granted Francisca de Valdés Osorio the marquisate of Valdunquillo.
The architecture of Valdunquillo consists mainly of adobe and brick with tile roofs, typical of Castile. Also typical of the area are its many palomares. The town is part of the comarca, Tierra de Campos. The area's first inhabitants were the Vaccaei, then it was occupied by the Romans, and then the Goths. It was also the border between Muslims and Christians during the Middle Ages. During the Medieval era and the Renaissance, the area was the breadbasket of Spain. As time passed, its importance declined, and people fled to large cities, like Valladolid, Sevilla, Madrid, and Barcelona.
Founded in 1607, the Mercedarian convent today serves as the actual San Pedro Church. The brick building was built in the 18th century. Although its façade is somewhat austere, inside it is ornate, with gilded altars and religious works of art.