Arthur B. Ripley Desert Woodland State Park, Desert woodland state park in Antelope Valley, United States.

Arthur B. Ripley Desert Woodland State Park covers 566 acres (229 ha) in the western Antelope Valley, about 20 miles west of downtown Lancaster in northern Los Angeles County. It protects mature stands of Joshua trees (Yucca brevifolia) and California juniper (Juniperus californica) in their western Mojave Desert habitat, a remnant of woodland once widespread across the valley.

Arthur Ripley donated this land to California in 1988 to protect one of the last remaining Joshua tree and juniper woodlands in Antelope Valley. The founding marked a key moment in efforts to preserve this endangered desert ecosystem.

The Joshua tree supplied food and fibre to the Native Americans who lived in the Antelope Valley, and the woodland that remains here is a fragment of the stands that once covered the valley floor. The junipers drew the attention of Otis M. (Milt) Stark, a Lancaster wildflower photographer and local historian who was among the volunteers who laid out the park's trails.

The park offers marked hiking trails where visitors can explore the woodlands and watch for wildlife without needing special equipment. A visit works year-round, though spring and fall offer the most comfortable conditions with moderate temperatures.

The trees here create striking silhouettes against the sky during sunrise and sunset, making it a favorite spot for photographers seeking that visual effect. This happens because the vegetation is sparse, so individual trees stand out boldly against the open desert landscape.