  Diagrammatic two-loop results are presented for the leading QCD corrections
to the masses of the neutral CP-even Higgs bosons in the Minimal Supersymmetric
Standard Model (MSSM). The results are valid for arbitrary values of the
parameters of the Higgs and scalar top sector of the MSSM. Their impact on a
precise prediction for the mass of the lightest Higgs boson is briefly
discussed.
