优胜美地国家公园（英语：Yosemite National Park、英语发音：/joʊˈsɛmɨti/ yoh-SEM-it-ee）是美国加州中东部横跨图奥勒米县、马里波萨县和马德拉县东部部分地区的国家公园。该公园占地747,956英亩（1,168.681平方英里；302,687公顷；3,026.87平方公里）并延伸到了横跨内华达山脉西坡。约塞米蒂国家公园每年大约有三百八十多万游客：大部分人在七平方英里（约合十八平方公里）的约塞米蒂山谷逗留。1984年，约塞米蒂被选定为世界遗产，其壮观的花岗岩峭壁、瀑布、清澈的溪流、巨型红杉林和生物多样性为国际所公认。该公园大约95%的地方被指定为公共莽原区。约塞米蒂虽然不是第一个指定的国家公园，但它对国家公园这个概念的发展起到了支配作用。这主要是由于像盖伦·克拉克和约翰·缪尔等人的工作所起的作用。

Yosemite National Park (/joʊˈsɛmᵻti/ yoh-SEM-it-ee) is a United States National Park spanning eastern portions of Tuolumne, Mariposa and Madera counties in the central eastern portion of the U.S. state of California, commonly considered part of Northern California. The park, which is managed by the National Park Service, covers an area of 747,956 acres (1,168.681 sq mi; 302,687 ha; 3,026.87 km) and reaches across the western slopes of the Sierra Nevada mountain chain. About 3.8 million people visit Yosemite each year: most spend the majority of their time in the seven square miles (18 km) of Yosemite Valley. Designated a World Heritage Site in 1984, Yosemite is internationally recognized for its spectacular granite cliffs, waterfalls, clear streams, giant sequoia groves, and biological diversity. Almost 95% of the park is designated wilderness. Yosemite was central to the development of the national park idea. First, Galen Clark and others lobbied to protect Yosemite Valley from development, ultimately leading to President Abraham Lincoln's signing the Yosemite Grant in 1864. Later, John Muir led a successful movement to establish a larger national park encompassing not just the valley, but surrounding mountains and forests as well—paving the way for the United States national park system.