Abstract
We discuss Grand Unified Theories (GUT) in higher dimensions with orbifold compactification. Even within the the simplest 5-dimensional (5D) SU(5)set-up many attractive features appear, such as orbifold GUT symmetry breaking, natural doublet-triplet splitting and suppression of proton decay etc. We also discuss gauge coupling unification in N=1 supersymmetric 5D orbifold SU(5) model. We have found that uncertainties in the predictions of the model are large and essentially uncontrollable. These uncertainties are related to the modification of the standard Kaluza-Klein mass spectrum induced by the kinetic terms localized at orbifold fixed points.
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