We discuss semileptonic B decays of the form B -> J/Psi
e nu X as possible probes for intrinsic charm. We calculate the
perturbative contribution to the exclusive channel B- -> J/Psi e- nu
and find a branching ratio of 6.8 x 10^(-10).
We estimate the intrinsic charm contribution and
find that it could be larger, although its precise value cannot be
calculated. Because the kinematically allowed upper limit for these
processes is of order 10^(-7), and because these channels have a
very clean experimental signature, we suggest that they should be
studied at the B factories and at hadron colliders.