  We compute the cross section for the production of a high-mass photon pair in
association with two hadronic jets to next-to-leading order (NLO) in quantum
chromodynamics (QCD). Our results allow for the first time to reliably predict
the absolute normalisation of this process, and demonstrate that the shape of
important kinematical distributions is modified by higher-order effects. The
perturbative corrections will be an important ingredient to precision studies
of Higgs boson properties from its production in association with two jets.
