A lamp (1) for lighting with an asymmetric light distribution comprises a casing (5) extending substantially along an axis (A), at least one light source (3) housed in the casing (5), and a substantially flat light guide panel (4) having a lateral edge (16), parallel to the axis (A) and facing the light source (3), for receiving the light emitted by the light source (3); the light guide panel (4) comprises a plate (10) made of substantially transparent material and an optical film (11) coupled to the plate (10); the optical film (11) is provided with an optical pattern (18) configured so as to extract the light, emitted by the light source (3), entering the plate (10) through the lateral edge (16), from the light guide panel (4) through a first face (13) of the plate (10), defining an emission surface (17) of the lamp (1); and it is configured so as to distribute the light with an asymmetric distribution in relation to the emission surface (17).