Mariposa Grove is a sequoia grove located near Wawona, California, United States, in the southernmost part of Yosemite National Park. It is the largest grove of Giant Sequoias in the park, with several hundred mature examples of the tree. Two of its trees are among the 25 largest Giant Sequoias in the world.
The Mariposa Grove was first visited by non-natives in 1857 when Galen Clark and Milton Mann found it. They named the grove after Mariposa County, California, where the grove is located.
The Giant Sequoia named Grizzly Giant is between probably 1900–2400 years old: the oldest tree in the grove. In 1932, park officials claimed it as the fifth largest (by volume) tree in the world, but other trees were subsequently found to be larger. It has a volume of 34,010 cubic feet (963 m3), and is counted as the 25th largest tree in the world. It is 210 feet (64 m) tall, and has a heavily buttressed base with a basal circumference of 28 m (92 ft) or a diameter of 30 feet (9.1 m); above the buttresses at 2.4 m above ground, the circumference is only 23 m. Grizzly Giant's first branch from the base is 2 m (6 ft) in diameter. Another tree, the Wawona Tree, had a tunnel cut through it in the nineteenth century that was wide enough for horse-drawn carriages and early automobiles to drive through. Weakened by the large opening at its base, the tree fell down in a storm in 1969.
Abraham Lincoln signed an Act of Congress on June 30, 1864 ceding Mariposa Grove and Yosemite Valley to the state of California. Criticism of stewardship over the land led to the state's returning the grove to federal control with the establishment of Yosemite National Park.
The Mariposa Grove Museum is listed on the National Register of Historic Places.