[en] The Spin Spectrometer at the Holifield Heavy Ion Research Facility (HHIRF) is a multidetector γ-ray spectrometer consisting of 72 separate NaI detector elements closely packed in a 4π geometry. The basic apparatus was constructed at Washington University and has been installed and implemented at the HHIRF at Oak Ridge National Laboratory. The spectrometer was designed especially for the investigation of the mechanisms of heavy-ion induced nuclear reactions and of the structure of nuclei with high angular momentum. The data acquisition system is described