Abstract: Method of determining the position of the optical axis of an optical waveguidde relative to a nominal axis, in which method the position of a light spot formed on a detector surface by a light beam leaving the optical waveguide is determined relative to the nominal position. A simple determination of the spatial position of an optical waveguide with respect to the angular and lateral position is possible in that the light beam is guided onto detector surfaces arranged at two different distances from the end face of the optical waveguide and in that the deviations of the light spots formed on the detector surfaces from their nominal positions are evaluated as criteria for the relative values of the angular and lateral positions of the optical waveguide.