Tassajara, a variation of the Spanish word "tasajera" (Spanish for "place where the meat is hung" or "meat drier"),[3] is an unincorporated community in Contra Costa County, California, United States.

[1] It is located on the east bank of Tassajara Creek, 6.5 miles (10 km) south-southeast of Mount Diablo,[4] at an elevation of 709 feet (216 m).

[1] Together with Blackhawk it forms the Blackhawk-Camino Tassajara census designated place (CDP).

Until 1959, it was known as Tassajero;.

[1] A post office operated at Tassajara from 1896 to 1922.