  We compute the NLO QCD corrections to the pair production of W-bosons in
association with two jets at the Tevatron and the LHC. This process is an
important background to heavy Higgs-boson production in association with two
jets, either in gluon or weak boson fusion. We consider leptonic decays of
W-bosons and include all the spin correlations exactly. For natural choices of
the renormalization scale, the NLO QCD corrections to pp(ppbar) -> W^+W^-jj are
moderate but different for various values of the center-of-mass collision
energy at the LHC and the Tevatron, emphasizing the need to compute them
explicitly.
