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