Spitzer Mid-Infrared Spectroscopy of 70um-Selected Distant Luminous . . . We present mid-infrared spectroscopy obtained with the Spitzer Space Telescope of a sample of 11 optically faint, infrared luminous galaxies selected from a Spitzer MIPS 70um imaging survey of the NDWFS Bootes field These are the first Spitzer IRS spectra presented of distant 70um-selected sources All the galaxies lie at redshifts 0 3<z<1 3 and have very large infrared luminosities of L_IR