Abstract: Testing the compatibility of the Higgs boson with mH ~ 125 GeV with the Standard Model predictions is a top priority of the LHC experimental program. Analysis of the WW decay mode of the Higgs boson at ATLAS provides the best single-channel signal strength measurement from Run 1 of the LHC. I will review key recent developments in this analysis and present results for the gluon fusion and vector-boson fusion Higgs boson production modes. Run 2 of the LHC just is around the corner, so I will also briefly describe searches for additional Higgs bosons and for rarer production modes using the WW final state.