  An approach is proposed to calculate Generalized Parton Distributions (GPDs)
in a Constituent Quark Model (CQM) scenario. These off-diagonal distributions
are obtained from momentum space wave functions to be evaluated in a given non
relativistic or relativized CQM. The general relations linking the twist-two
GPDs to the form factors and to the leading twist quark densities are
consistently recovered from our expressions. Results for the leading twist,
unpolarized GPD, H, in a simple harmonic oscillator model, as well as in the
Isgur and Karl model, are shown to have the general behavior found in previous
estimates. NLO evolution of the obtained distributions, from the low momentum
scale of the model up to the experimental one, is also shown. Further natural
applications of the proposed formalism are addressed.
