Beyond-the-Standard-Model Higgs physics with the ATLAS experiment

The discovery of a Higgs boson with a mass of about 125 GeV has prompted the question of whether or not this particle is part of a larger and more complex Higgs sector than that envisioned in the Standard Model. In this talk, the current results from the ATLAS Experiment on Beyond-the-Standard Model (BSM) Higgs searches are outlined. Searches for additional Higgs bosons are presented and interpreted in BSM Higgs frameworks, such as two-Higgs-doublet Models, Minimal Supersymmetric Standard Model and Higgs portal models.