In the current LHC run, an accurate understanding of Standard Model processes is extremely important. Processes including electroweak gauge bosons serve as standard candles for SM measurements, and equally constitute important backgrounds for Beyond the-Standard Model (BSM) searches. We present here the next-to-leading order (NLO) QCD virtual contributions to W+W−+jet in an analytic format obtained through unitarity methods. We present results for the full process using the Monte Carlo event generator MCFM, and discuss total as well as differential cross-sections for the LHC with 14 TeV center of-mass energy, as well as a future 100 TeV proton-proton machine.