We have used the Planetary Camera aboard the Hubble Space Telescope to obtain high spatial resolution [O III] λ5007 and Hα λ6563+[N II] λλ6548, 6583 images of the nucleus of NGC 4151. Almost all of the Hα λ6563+[N II] λλ6548, 6583 emission arises from an unresolved nuclear point source. The [O III] λ5007 image resolves the narrow-line region into a number of emission-line clouds distributed in a biconical structure with apices coincident with a central point source, a projected opening angle of 75°±10°, and a projected axis oriented along P.A. 60°/240°±5°. The position angle of the [O III] λ5007 emission is aligned with the extension of the nuclear VLBI radio source