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I present a detailed SUSY QCD calculation of the decay rate of the lightestHiggs boson $H^0_2$\ into two gluons, where all quarks and scalar quarks aretaken within the relevant loop diagrams. I include the mixing of all the scalarpartners of the left and right handed quarks and show that their contributionis more than several tens of per cent compared to the quark contribution in theMSSM for some SUSY parameter space. Furthermore the fermionic contribution isenhanced by several factors for large $\tan\beta$\ and large Higgs masses. As aresult, the two gluon decay rate of $H_2^0$\ is much larger than the two gluondecay rate of an equal mass standard model Higgs boson. I further compare thedecay mode of $H^0_2\rightarrow gg$\ to the similar decay modes of$H^0_2\rightarrow c\overline c$\ and $H^0_2\rightarrow b\overline b$\ includingone loop QCD corrections and show that in some cases $\Gamma(H^0_2\rightarrowgg)$\ is even higher than $\Gamma(H^0_2\rightarrow c\overline c)$, althoughstill much smaller than $\Gamma(H^0_2\rightarrow b\overline b)$.Comment: 9 pages, plain tex, 6 figures not included, available under request.  (a reference was added and an error in eq.(7) was corrected. Fig.3-5 are only  changed for tan\beta=60 and small scalar masses m_S and Fig.6 is only changed  for tan\beta=60 and small Higgs mass m_{H_2^0}

The decay H 0 2 →gg within the Minimal Supersymmetric Standard Model