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We consider two simple examples of multi-instanton configurations in type II4d N=1 superstring compactifications. The first one involves O(1) and U(1)D2-instantons embedded in T^6/(Z_2 x Z_2') geometry with SU(4) gauge symmetrycoming from D6-branes and the second is related to quiver gauge theory oforientifolded orbifold of conifold containing fractional D(-1)-instantons andD3-branes. The additional zero modes of instantons which appear at theintersection points are lifted through interactions stemming from dimensionallyreduced F- and D-terms. It is shown that multi-instanton configurationseffectively generate corrections to the usual non-perturbative superpotentialfor chiral matter.

Multi-Instanton Corrections to Superpotentials in Type II Compactifications