This catalog contains wavelength information for 99 different atomic species. The wavelengths for about 46,610 spectral lines of neutral through quadruply ionized atoms are tabulated. The information is presented in a general table of headers and references for each element and for each element a table of relative intensities, wavelengths ordered numerically, chemical elements, and stages of ionization indicated for each line in the wavelength range 40 to 40,000 Angstroms. Listed in the 99 data files are lines that appear in emission from the vacuum ultraviolet to the far infrared. For most atoms these lines are chosen from much larger lists so as to include the stronger observed lines in each spectral region. Below 2000 Angstroms the wavelengths are in vacuum; above 2000 Angstroms the wavelengths are in air. Wavelengths given to three decimal places are suitable for spectrograph calibration purpose such as Ne, Ar, Kr, Fe in the air region and C, N, O, Si, and Cu in the vacuum region. The intensity estimates are useful only as a rough indication of the appearance of a spectrum. The literature references as they appear the the the Handbook of Chemistry and Physics are given in a separate file.