| Peralillo Department | |
| Native Name: | Departamento de Peralillo |
| Native Name Lang: | es |
| Settlement Type: | (Proposed) Department of Chile |
| Mapsize: | 150px |
| Map Alt: | Location of Peralillo Department in the Libertador General Bernardo O'Higgins Region |
| Subdivision Type: | Country |
| Subdivision Name: | Chile |
| Subdivision Type1: | Former province |
| Subdivision Name1: | Colchagua Province |
| Parts Type: | Communes |
| Parts Style: | list |
| Parts: | List of 7: |
| P1: | Paredones |
| P2: | Pumanque |
| P3: | Pichilemu |
| P4: | Marchigüe |
| P5: | La Estrella |
| P6: | Rosario Lo Solís (now Litueche) |
| P7: | Peralillo |
| Established Title: | Proposed |
| Established Date: | 5 September 1972 |
| Seat Type: | Capital |
| Seat: | Peralillo |
| Timezone: | CLT[1] |
| Utc Offset: | -4 |
| Timezone Dst: | CLST[2] |
| Utc Offset Dst: | -3 |
The Peralillo Department (Spanish; Castilian: Departamento de Peralillo) was a proposed Chilean department in September 1972 by President Salvador Allende Gossens, with the purpose of de-centralizing the Santa Cruz Department. Peralillo was proposed as the capital of the department by the Member of the Chamber of Deputies Héctor Ríos. The communes which were proposed to form the department were the capital, Marchigüe, Pichilemu, Rosario Lo Solís (now Litueche), La Estrella and Pumanque.[3] [4]
The project of the Peralillo Department, however, was rejected, and the Cardenal Caro Department was created instead, with Marchigüe as the capital, on 13 July 1973, by decree of President Allende.[5]