  The J/psi-hadron interaction is a key ingredient in analyzing the J/psi
suppression in hot hadronic matter as well as the propagation of J/psi in
nuclei. As a first step to clarify the J/psi-hadron interactions at low
energies, we have calculated J/psi-pi, J/psi-rho and J/psi-nucleon scattering
lengths by the quenched lattice QCD simulations with Wilson fermions for
beta=6.2 on 24^3*48 and 32^3*48 lattices. Using the Luscher's method to extract
the scattering length from the simulations in a finite box, we find an
attractive interaction in the S-wave channel for all three systems: Among
others, the J/psi-nucleon interaction is most attractive. Possibility of the
J/psi-nucleon bound state is also discussed.
