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The electron-positron stage of the Future Circular Collider, FCC-ee, is afrontier factory for Higgs, top, electroweak, and flavour physics. It isdesigned to operate in a 100 km circular tunnel built at CERN, and will serveas the first step towards $\geq$ 100 TeV proton-proton collisions. In additionto an essential and unique Higgs program, it offers powerful opportunities todiscover direct or indirect evidence of physics beyond the Standard Model.  Direct searches for long-lived particles at FCC-ee could be particularlyfertile in the high-luminosity $Z$ run, where $5\times 10^{12}$ $Z$ bosons areanticipated to be produced for the configuration with two interaction points.The high statistics of Higgs bosons, $W$ bosons and top quarks in very cleanexperimental conditions could offer additional opportunities at other collisionenergies. Three physics cases producing long-lived signatures at FCC-ee arehighlighted and studied in this paper: heavy neutral leptons (HNLs), axion-likeparticles (ALPs), and exotic decays of the Higgs boson. These searches motivateout-of-the-box optimization of experimental conditions and analysis techniques,that could lead to improvements in other physics searches.

Searches for Long-Lived Particles at the Future FCC-ee