Studies of the SM Higgs boson and searches for BSM Higgs bosons with the ATLAS Detector

The ATLAS collaboration has searched for the Standard Model Higgs Boson in the first LHC Run-2 data using 3.2 $fb^{-1}$ at 13 TeV. Results are presented in terms of central value and limits on the total cross-section in the 4l and $\gamma\gamma$ channels. Several "Beyond Standard Model" theories predict the existence of additional heavy Higgs particles or di-Higgs resonances. Searches are conducted using the $\gamma\gamma$, ZZ, WW and fermionic decay channels, and cover a large range of masses for the hypothetical resonances.