We compute the warping of a disc induced by an inclined dipole .
We consider a magnetised star surrounded by a thin Keplerian diamagnetic disc with an inner edge that corotates with the star .
We suppose the stellar field is a dipole with an axis that is slightly misaligned with the stellar rotation axis .
The rotation axes of the disc material orbiting at large distances from the star and that of the star are supposed to coincide .
The misalignment of the magnetic and rotation axes results in the magnetic pressure not being the same on the upper and lower surfaces of the disc .
The resultant net vertical force produces a warp which appears stationary in a frame corotating with the star .
We find that , if viscosity is large enough ( \alpha \sim 0.01 –0.1 ) to damp bending waves as they propagate away , a smoothly varying warp of the inner region of the disc is produced .
The amplitude of the warp can easily be on the order of ten percent of the disc inner radius for reasonably small misalignment angles ( less than 30 degrees ) .
Viscous damping also introduces a phase shift between the warp and the forcing torque , which results in the locations of maximum elevation above the disc forming a trailing spiral pattern .
We apply these results to recent observations of AA Tau , and show that the variability of its light curve , which occurs with a period comparable to the expected stellar rotation period , could be due to obscuration produced by a warp configuration of the type we obtain .