Beitr\"age zur Algebra und Geometrie Contributions to Algebra and Geometry Volume 36 (1995), No. 1 Characterization of Higher-order Tangent Bundles M. de Le\'on, J. A. Oubi\~na and M. Salgado Tangent bundles of higher order are the framework on which the higher order Lagrangian theories are developed. Moreover, almost tangent manifolds of higher order have been shown to be relevant in singular Lagrangian theories. The purpose of this paper is to prove that under some global hypotheses a higher order integrable almost tangent manifold is diffeomorphic to the tangent bundle of the same order of some manifold. An application to the reduction of singular Lagrangians is given. MSC 1991: 53C15, 58F05, 70H35.