Wavelengths and their classifications are compiled for the spectra of magnesium. Selections of data are based on the critical evaluations in the compilation of energy levels by Martin and Zalubas [1980, J. Phys. Chem. Ref. Data9, 1–58], with some updating from the more recent literature. All classifications have been verified with predictions made by differencing the energy levels. In addition to the spectra ordered by ionization state, two finding lists are included, one containing Mg I to Mg III and the other Mg IV to Mg XII.