Abstract The motion of a fluid film squeezed between two rotating parallel naturally permeable discs has been studied in the presence of a magnetic field applied perpendicular to the surface. We have obtained the similarity solutions using regular perturbations and numerical technique. The combined effects of magnetic field, centrifugal inertial forces, and the permeabilities of the porous medium on the velocity profiles, the load capacity and the torques that the fluid exerts on the surfaces have been determined. In general, the results are similar to HAMZA [1] except that the slippage of the fluid particles at the boundaries pushes the fluid away from the rotating axis.