After the discovery of a Higgs boson, the measurement of its properties plays a very important role at the LHC. The determination of the associated production of the Higgs boson and a top-antitop quark pair ($t\bar{t}H$ production) is of particular importance as it offers a tree-level access to measuring the Higgs-top Yukawa coupling. With a predicted numerical value close to unity, this coupling plays a crucial role in the stability of the Higgs potential at high energy scales and can also be a probe for physics beyond the Standard Model (SM) through fine deviations from the SM predictions.
The $t\bar{t}H$ production analysis at ATLAS exploits several Higgs decay modes, together with different top quark decay modes. In this proceeding, the latest results on the search for the $t\bar{t}H$ process in four final states with ATLAS is presented, with particular focus on the multilepton final state.