The Old Woman Meteorite is the largest meteorite found in California and the second largest in the United States. It was discovered in the Old Woman Mountains in southern California in late 1975. It is 38 inches (970 mm) long, 34 inches (860 mm) high, and 30 inches (760 mm) wide. The meteorite is mostly composed of iron, but also contains nickel (about 6%), as well as small amounts of chromium, cobalt, phosphorus, and sulfur.

The main mass was put on display in the Smithsonian Institution from 1978 to 1980, and now resides in the Desert Discovery Center in Barstow, California. It originally weighed 6,070 pounds (2,750 kg), but has since had a 942 pounds (427 kg) slice removed for scientific study. A 177.4 pounds (80.5 kg) slab is on display in the UCLA meteorite museum.