Fluorescence spectra and lifetimes of ovalbumin labeled with a variety of fluorescent reagents have been measured. The peak positions of the emission spectrum and the long wavelength band of the excitation spectrum as well as the fluorescence lifetimes, are tabulated. Heterogeneity of binding sites is shown by the broadness of some emisison spectra and the presence of multiexponential decay. The atlas may serve as a guide to the properties of these dyes attached to proteins in general.