Rare Kaon Decay Experiments at CERN

The NA62 experiment at the CERN SPS aims to measure the branching ratio of the rare decay with a relative precision of ∼10%. To achieve that goal, it is designed to be exposed to 1.2×1013K+ decays in its fiducial volume. The unprecedented K+ flux will lead to record sensitivities to rare and forbidden decays of K+ and π0, including those that violate lepton flavour or lepton number conservation. The expected NA62 performances for lepton flavour conservation and lepton universality tests are discussed. Relevant on-going or recently completed measurements from the K± decay data sets collected by earlier kaon experiments at CERN (NA48/2 and NA62-RK) are also presented.