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 run-2 data using 3.2 fb^(-1) at 13 TeV. Results are presented in terms of central value and limits on the fiducial and total cross-sections. 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.