Frank G. Bonelli Regional Park, Regional park in Los Angeles County, United States

Frank G. Bonelli Regional Park is a man-made recreation area in San Dimas, Los Angeles County, beside the Orange, Foothill and San Bernardino freeways. Its centre is Puddingstone Reservoir, a 250-acre lake used for fishing, swimming, sailing, windsurfing, boating and jet skiing, with a waterfall. The park also holds six playgrounds, barbecue areas, hiking and biking trails, and picnic grounds, some reserved for company and church gatherings.

The park is a man-made recreation area in San Dimas, Los Angeles County, named after Frank G. Bonelli, a former member of the Los Angeles County Board of Supervisors. Its 250-acre lake, Puddingstone Reservoir, was created for fishing, swimming, sailing, windsurfing, boating and jet skiing. From June 30, 2025, county budget cuts closed the park on Mondays and Tuesdays, along with five other regional parks.

The park is named after Frank G. Bonelli, a former Los Angeles County Supervisor. Private picnic areas for company, church and group gatherings are run exclusively by James Events under contract with Los Angeles County Parks and Recreation, while families and small groups can reserve other areas directly with the park.

The park is closed on Mondays and Tuesdays, a measure that began on June 30, 2025, following Los Angeles County budget cuts. It sits near the Orange Freeway (State Route 57), the Foothill Freeway (Interstate 210) and the San Bernardino Freeway (Interstate 10). Kayak rentals are run by Wheel Fun, and RV campgrounds sit next to the park as a separate facility.

The park is scheduled to host the mountain biking events of the 2028 Summer Olympics in Los Angeles. The course will run through the park's terrain around Puddingstone Reservoir, a 250-acre lake.