In most of the mass range encompassed by the limits from the direct searchand the electroweak precision tests, the Higgs boson of the standard modelpreferably decays to bottom quarks. We present, in analytic form, the dominanttwo-loop electroweak correction, of O(G_F^2 m_t^4), to the partial width ofthis decay. It amplifies the familiar enhancement due to the O(G_F m_t^2)one-loop correction by about +16% and thus more than compensates the screeningby about -8% through strong-interaction effects of order O(alpha_s G_F m_t^2).
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