The top-quark mass is one of the fundamental parameters of the Standard Model of particle
physics. The latest ATLAS measurements of the top-quark mass in top quark pair final states
are presented. Measurements use di-lepton, lepton+jets and all-jets final states and their com-
bination is performed. Measurements of the top-quark pole mass based on precision theoretical
QCD calculations for lepton kinematic distribution and for top quark pair production with an
additional jet are also presented.