  Dark sector particles at the GeV scale carrying baryon number provide an
attractive framework for understanding the origin of dark matter and the
matter-antimatter asymmetry of the universe. We demonstrate that dark decays of
hadronic states containing strange quarks -- hyperons -- offer excellent
prospects for discovering such dark baryons. Building up on novel calculations
of the matrix elements relevant for hyperon dark decays, and in view of various
collider, flavor, and astrophysical constraints, we determine the expected
rates at hyperon factories like BESIII and LHCb. We also highlight the
interesting theoretical connections of hyperon dark decays to the neutron
lifetime anomaly and Mesogenesis.
