  String instanton effects in Higgs physics are discussed through a type IIA
model based on T^{6}/(Z^{2}\times Z^{'2}) orentifold compactifaction. By
inclusion of rigid E2-branes, the model exhibits a MSSM-like spectrum, as well
as extra mu and quartic Higgs couplings. These extra couplings are induced via
E2 instantons non-perturbatively. Setting the string scale at 10^{18} GeV, one
gets interesting TeV Higgs physics. In particlular, the tree-level Higgs mass
can be uplifted substantially.
