  Generalized parton distribution functions (GPDs) of spin-3/2 particles are
defined for the first time in this paper. Eight unpolarized and eight polarized
GPDs are found. In the forward limit of GPDs, the structure functions and
parton distribution functions are obtained. Then, the sum rules that connect
the GPDs with the electromagnetic and gravitational form factors are explicitly
displayed. Finally, the relations between GPDs and the helicity amplitudes of
the system are derived.
