Axions may also be produced at colliders, in particular in electron positron collisions as well as in ultra-peripheral heavy ion collisions at the Large Hadron Collider at CERN, reinterpreting the light-by-light scattering process. Those searches are sensitive for rather large axion masses between 100 MeV/c and hundreds of GeV/c. Assuming a coupling of axions to the Higgs Boson, searches for anomalous Higgs boson decays into two axions can theoretically provide even stronger limits.