The catalog contains intrinsic ultraviolet colors for normal stars between O6.5V and K3III. These have been derived from the absolute ultraviolet fluxes obtained by the S2/68 Ultraviolet Sky Survey Telescope aboard the ESRO TD1 satellite, corrected to the standard calibration of Bohlin et al. (1981) for the star eta UMa. The catalog contains 671 records, one for each MK spectral type and luminosity class between O6.5Ia and K3V. Each record consists of twenty-five broad- and narrow-band colors in the form (m(lambda) - V)(0) covering the wavelength range 1400A to 2740A. Complementary data including (B-V)(0), (U-B)(0), and absolute visual magnitude, M(v), are also given for each type. The intrinsic ultraviolet colours cover three groups of passbands: (1) Four broadband fluxes (width 330 Angstroms) centred on 1565A, 1965A, 2365A and 2740A. (2) Nine narrowband fluxes (width 110 Angstroms) centred on 1455A, 1565A, 1675A, 1855A, 1965A, 2075A, 2255A, 2365A, 2465A (3) Twelve narrowband fluxes (width 100 Angstroms) centred on 1400A, 1500A, 1600A, 1700A, 1800A, 1900A, 2000A, 2100A, 2200A, 2300A, 2400A, 2500A