  We present $g^\prime$ and $z^\prime$ aperture photometry for 96 Galactic
Globular Clusters, making this the largest homogeneous catalog of photometry
for these objects in the SDSS filter system. For a subset of 56 clusters we
also provide photometry in $r^\prime$ and $i^\prime$. We carry out comparisons
with previous photometry as well as with the SDSS dataset. The data will be
useful for a series of applications in Galactic and extragalactic astrophysics.
Future papers will analyse the colour-metallicity relation, colour-magnitude
diagrams, and structural parameters. The compilation of results based on this
dataset will be collected in the Galactic Globular Cluster Catalog (G2C2).
