Searches for new resonances with the ATLAS detector

Resonances decaying into a pair of particles are an obvious place to look for phenomena beyond the Standard Model. This talk summarizes recent results on searches for resonances in pairs of jets, leptons, lepton and jet, photon and jet, as well as pairs of photons or W/Z/H bosons. Various models are considered such the Z' and W', the Randall-Sundrum gravitons as well as the ADD large extra dimension scenario, excited quarks, quantum black holes, technicolor and contact interactions. Another powerful approach is to search for anomalous production of like-sign dilepton or multilepton signatures, which provide model-independent constraints as well as probe models with excited leptons or heavy leptons. Results from sqrt(s) = 8 TeV are presented. Prospects at HL-LHC will also be discussed as an outlook.