Integrated spectra of 55 nearby normal and peculiar galaxies have been compiled into a spectrophotometric atlas. Most observations cover the spectral range 3650-7100 angstrom, with a resolution of 5-8 angstrom, and sufficient signal-to-noise ratio to measure the prominent emission and absorption features. The spectra have been reduced to a common spectrophotometric scale and are presented as a series of plots, arranged according to morphological and spectral types. A digital version of the data is also available. The general characteristics of the integrated spectra of galaxies are discussed.