We present an atlas of 271 diffuse interstellar bands (DIBs) between 4460 and 8800A based on echelle spectra (R=45,000), more than 100 of which are new DIB discovered in this survey. It is restricted mostly to narrow features and we describe the tests for an interstellar origin. The rest wavelength of each DIB was determined in a high quality composite spectrum of the star HD 23180 using the interstellar NaI (D_1 and D_2) lines to establish the radial velocity of the single intervening cloud. Our quoted DIB wavelengths are probably accurate to ~0.1 A. Other, weak DIB found in the spectra of heavily reddened stars are included with a lower wavelength precision.