  We propose a class of forward-backward asymmetries with respect to the
subprocess c.m. scattering angle in $V$+jet production at hadron colliders,
with V being any of (W, Z, $\gamma$, H), which are directly proportional to the
gluon distribution $g(x)$. The informations that these asymmetries can provide
are complementary of those reachable from measurements of the transverse
momentum and/or the rapidity distributions of a $V$ in kinematical regimes
where gluon scattering subprocesses dominate. The accuracy which can be reached
in the W, Z and $\gamma $ cases, at the upgraded Tevatron and at LHC, should
allow a considerable improvement of our knowledge of the gluon distribution
function, especially at large x.
