约书亚树国家公园（Joshua Tree National Park）是一个位于南加州的美国国家公园。该公园由美国国会通过1994年《加里福尼亚沙漠保护法》而成立。在这之前，约书亚树曾是一个国家纪念区。约书亚树国家公园的命名来自于约书亚树，一种大型丝兰，同时也是莫哈维沙漠的代表性植物。约书亚树国家公园占地790636英亩（约1235.37平方英里；3199.59平方公里）——一片比罗得岛州稍大点的区域。该公园的大部分，大约429690英亩（173890公顷）被指定为公共莽原区。该公园跨越圣贝纳迪诺县/里弗赛德县边界，包括两个沙漠的部分地区，每个沙漠的生态系统特征主要由海拔决定：海拔较高的莫哈韦沙漠和海拔较低的科罗拉多沙漠。小圣贝纳迪诺山脉贯穿该公园的西南边界。

Joshua Tree National Park is located in southeastern California. Declared a U.S. National Park in 1994 when the U.S. Congress passed the California Desert Protection Act (Public Law 103-433), it had previously been a U.S. National Monument since 1936. It is named for the Joshua trees (Yucca brevifolia) native to the park. It covers a land area of 790,636 acres (1,235.37 sq mi; 3,199.59 km) – an area slightly larger than the state of Rhode Island. A large part of the park, some 429,690 acres (173,890 ha), is a designated wilderness area. Straddling the San Bernardino County/Riverside County border, the park includes parts of two deserts, each an ecosystem whose characteristics are determined primarily by elevation: the higher Mojave Desert and lower Colorado Desert. The Little San Bernardino Mountains run through the southwest edge of the park.