We describe the vacuum calibration facilities located at the Space Sciences Laboratory, University of California at Berkeley, which are designed for the calibration and testing of extreme and far ultraviolet space-borne instrumentation in the spectral range 44 to 2500 A. The facility includes one large cylindrical vacuum chamber (3 m x 5 m) containing two EUV collimators, and it is equipped with a 4-axis manipulator of angular control resolution of 1 arcsec for payloads weighing up to 500 kg. In addition, two smaller cylindrical chambers, each 0.9 m x 1.2 m, are available for vacuum and thermal testing of UV detectors, filters, and space electronics hardware. All three chambers open into Class 10,000 clean rooms, and all calibrations are referred to NBS secondary standards. Users of the facility to date include the EUVE, FAUST, and UVX Shuttle payload projects.