  We measure the two-point redshift-space correlation function of loose groups
of galaxies, xi_GG, for the combined CfA2 and SSRS2 surveys. Our combined group
catalog constitutes the largest homogeneous sample available (885 groups). We
compare xi_GG with the correlation function of galaxies, xi_gg, in the same
volume. We find that groups are significantly more clustered than galaxies:
<xi_GG/xi_gg>=1.64+-0.16. A similar result holds when we analyze a
volume-limited sample (distance limit 78 h^-1 Mpc) of 139 groups. For these
groups, with median velocity dispersion sigma_v sim 200 km s^-1 and mean group
separation d sim 16 h^-1 Mpc, we find that the correlation length is s_0=8+-1
h^-1 Mpc, which is significantly smaller than that found for rich clusters. We
conclude that clustering properties of loose groups of galaxies are
intermediate between galaxies and rich clusters. Moreover, we find evidence
that group clustering depends on physical properties of groups: correlation
strengthens for increasing sigma_v.
