  We show that the minimal renormalizable supersymmetric SO(10) GUT with the
usual three generations of spinors has a Higgs sector consisting only of a
"light" 10-dimensional and "heavy" 126, 126-bar and 210 supermultiplets. The
theory has only two sets of Yukawa couplings with fifteen real parameters and
ten real parameters in the Higgs superpotential. It accounts correctly for all
the fermion masses and mixings. The theory predicts at low energies the MSSM
with exact R-parity. It is arguably the minimal consistent supersymmetric grand
unified theory.
