The Boole Tree is a giant sequoia in Converse Basin grove in Sequoia National Forest, in the edge of Kings Canyon, 5 miles (8 km) from General Grant Grove in Kings Canyon National Park in the Sierra Nevada in eastern California. Converse Basin used to be a large grove, but was logged of most of its giant sequoias between 1892 and 1918. Now only perhaps 60–100 large specimens survive out of thousands.
This grove is the second largest contiguous grove in the World. The Boole Tree, by far the largest in Converse Basin Grove, was named around 1895 by A.H. Sweeny, a Fresno doctor, after Franklin A. Boole, a supervisor of the logging operation who spared the tree's life due to its great size. Before 1931, it was thought by many to be the largest tree in the world (although the General Grant Tree was more popularly known as the largest tree in the world at that time), but it is now known as the sixth largest tree, after five other giant sequoias: the General Sherman tree, the General Grant, the President tree, the Lincoln tree, and the Stagg tree.