An optical solution to boresight error using tilted optical elements is presented. It can correct dynamic boresight error for conformal windows which vary with look angle. A model of boresight error for conformal windows is established, and dynamic boresight error introduced by a conformal window is calculated. The principle of boresight error correction of conformal optical windows with titled optical elements is stated, which is proved by adding a tilted spherical lens behind a conformal window. A design example is presented, and by tilting the corrector which is used to correct the conformal window aberration, the boresight error for the conformal window is corrected while the aberration correction for the window is not hindered.