Searches for diboson resonances with the ATLAS detector at the LHC

Resonant production of two bosons (gammagamma, VV, VH and HH) is a clear hint for physics beyond the Standard Model, potentially related to the nature of electroweak symmetry breaking mechanism in the SM. Searches for diboson resonances have been performed in gammagamma and in final states with different numbers of leptons and jets including cases where the two jets are merged into one because of the large boost. ATLAS searches for diboson resonances with LHC Run 2 data at 13 TeV are summarized in this talk