A backlight module includes a plate and a plurality of light sources. The plate has a first surface and a second surface opposite to the first surface. The plate is bent to form a plurality of first grooves on the first surface and a plurality of second grooves on the second surface. The light sources are respectively disposed in the first grooves and the second grooves. The backlight module is capable of providing two plane light sources to different directions and has thinner thickness. A double-sided liquid crystal display using the above-mentioned backlight module is also provided.