  Recently there has been a resurgence of interest in gauge mediated dynamical
supersymmetry breaking scenarios. I investigate how low energy dynamical SUSY
breaking may arise from superstring models. In a three generation string
derived model I propose that the unbroken hidden non--Abelian gauge group at
the string scale is $SU(3)_H$ with matter multiplets. Due to the small gauge
content of the hidden gauge group the supersymmetry breaking scale may be
consistent with the dynamical SUSY breaking scenarios. The messenger states are
obtained in the superstring model from sectors which arise due to the
``Wilson--line'' breaking of the unifying non--Abelian gauge symmetry. An
important property of the string motivated messenger states is the absence of
superpotential terms with the Standard Model states. The stringy symmetries
therefore forbid the flavor changing processes which may arise due to couplings
between the messenger sector states and the Standard Model states. Motivated
from the problem of string gauge coupling unification I contemplate a scenario
in which the messenger sector consists solely of color triplets. This
hypothesis predicts a chargino mass below the $W$--boson mass. Imposing the
current limits from the LEP1 and LEP1.5 experiments the lightest supersymmetric
particles predicted by this hypothesis are in the mass ranges
$M_{\chi^\pm}\approx55-65$ GeV, $M_{\chi^0}\approx35-50$ GeV and
$M_{\tilde\nu}\approx45-60$ GeV which will be tested in the forthcoming LEP2
experiments.
