  We present new HST I-band images of a sample of 77 nearby, late-type spiral
galaxies with low inclination. The main purpose of this catalog is to study the
frequency and properties of nuclear star clusters. In 59 galaxies of our
sample, we have identified a distinct, compact (but resolved), and dominant
source at or very close to their photocenter. In many cases, these clusters are
the only prominent source within a few kpc from the galaxy nucleus. We present
surface brightness profiles, derived from elliptical isophote fits, of all
galaxies for which the fit was successful. We use the fitted isophotes at radii
larger than 2" to check whether the location of the cluster coincides with the
photocenter of the galaxy, and confirm that in nearly all cases, we are truly
dealing with ``nuclear'' star clusters. From analytical fits to the surface
brightness profiles, we derive the cluster luminosities after subtraction of
the light contribution from the underlying galaxy disk and/or bulge.
