Abderemane MORAME Absence of singular spectrum for a perturbation of a two-dimensional Laplace-Beltrami operator with periodic electro-magnetic potential (40K, LATeX 2e) ABSTRACT. We consider a metric g, a real one-form A and a real function V, all periodic for some lattice in dimension two of the real space. We prove that the covariant Laplace-Beltrami operator, associated to g and A and perturbed by V, has continuous spectrum