Pacheco State Park, State park in Merced County, California, United States

Pacheco State Park is a nature reserve in the Diablo Range comprising rolling grasslands and mountainous terrain across several thousand acres. The landscape rises to elevations around 1,900 feet and is dominated by open meadows interspersed with scattered trees and shrubland.

The park takes its name from Californio ranchero Don Francisco Pérez Pacheco, whose Rancho San Luis Gonzaga held the land from 1843 as a horse and cattle ranch. In 1997 it became the last piece of that rancho added to the state park system, five years after Paula M. Fatjó, Pacheco's great-great granddaughter, bequeathed it to California.

The park is named for Californio ranchero Don Francisco Pérez Pacheco, whose family held the land as a horse and cattle ranch from 1843. Paula M. Fatjó, his great-great granddaughter, bequeathed it to the state. Visitors can still see an old line shack used by a cattle company in the 1800s and the ruins of the original Pacheco adobe.

The park offers an extensive network of trails for hiking, horseback riding, and mountain biking with routes ranging from short walks to full-day adventures. Visitors should bring plenty of water and snacks since there are no facilities or drinking sources within the park boundaries.

The eastern two-thirds of the park are closed to visitors because of an underdeveloped trail system and safety concerns over the Gonzaga Wind Farm's turbines, installed in the 1980s to produce 16.5 megawatts. In 2018 Quinbrook Infrastructure Partners won a lease to replace them with models rated up to 80 megawatts.