Searches for a charged Higgs boson in various decay channels using 36.1 ifb of pp collision data at a centre-of-mass energy of 13 TeV collected with the ATLAS detector at the Large Hadron
Collider are presented. No significant excess above the background-only hypothesis is observed and upper limits on the production cross-section times the branching ratio of the charged Higgs boson as a function of its mass are derived. The results are interpreted in benchmark scenarios of the Minimal Supersymmetric Standard Model.