Donner Memorial State Park is a state park of California, US, preserving the site of the Donner Camp, where members of the ill-fated Donner Party were trapped by weather during the winter of 1846–1847. Caught without shelter or adequate supplies, members of the group resorted to cannibalism to survive. The Sierra Nevada site has been designated a National Historic Landmark. The state park contains the Emigrant Trail Museum and the Pioneer Monument dedicated to the travelers of the Emigrant Trail.

The Donner Party, sometimes called the Donner–Reed Party, were a group of American pioneers who migrated to California in a wagon train from the Midwest. Delayed by a multitude of mishaps, they spent the winter of 1846–1847 snowbound in the Sierra Nevada mountain range. Some of the migrants resorted to cannibalism to survive, primarily eating the bodies of those who had succumbed to starvation, sickness or extreme cold, but in one case two Native American guides were deliberately killed for this purpose.