The P?o Pico State Historic Park is a state park and historic site in Whittier, California. It was created in efforts to preserve the site of ?El Ranchito or the Pio Pico Adobe, also known as the Pio Pico Mansion.

The Pio Pico Mansion is a historically significant site due to its connection to Pio Pico. Pico is Alta California?s last governor and is an important figure in the early California history. The site is listed on the National Register of Historic Places and a designated California Historical Landmark (#127). The park features the main house and three acres of the surrounding area featuring historic gardens.

The Pio Pico State Historic Park is open all year round for tours except on all major holidays.