engThe ATLAS collaborationSearch for displaced leptons in $\sqrt{s} = 13$ TeV pp collisions with the ATLAS detectorParticle Physics - ExperimentATLAS-CONF-2020-051A search for charged leptons with large impact parameters using 139 fb$^{-1}$ of $\sqrt{s} = 13$ TeV $pp$ data from the ATLAS detector at the LHC is presented, addressing a long-standing gap in coverage of possible new physics signatures. Results are consistent with the background prediction. This search provides unique sensitivity to long-lived scalar supersymmetric lepton-partners (sleptons). For 0.1 ns lifetimes selectron, smuon and stau masses up to 720 GeV, 680 GeV, and 340 GeV are excluded, respectively, at 95% CL drastically improving on the previous best limits from LEP.2020-10-06http://cds.cern.ch/record/2740685Conference talks on ATLAShttp://cds.cern.ch/record/2740685oai:cds.cern.ch:2740685All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2020-051