  We present theoretical predictions for the Higgs boson production
cross-section via gluon fusion at the LHC in a Standard Model with four
generations. We include QCD corrections through NLO retaining the full
dependence on the quark masses, and the NNLO corrections in the heavy quark
effective theory approximation. We also include electroweak corrections through
three loops. Electroweak and bottom-quark contributions are suppressed in
comparison to the Standard Model with three generations.
