A backlight assembly includes a receiving container, lamps, a diffusion plate and a lamp-fixing member. The receiving container includes a bottom plate and sidewalls together providing a receiving space. The lamps are arranged substantially parallel to each other on the bottom plate. The diffusion plate is disposed over the lamps. The lamp-fixing member includes a body portion extending substantially perpendicular to the lamps, a buffer protruding upwardly from the body portion, a diffusion plate supporting portion protruding from the buffer to support the diffusion plate and a lamp-fixing portion formed at the body portion to fix the lamps. Therefore, the buffer having elasticity is formed at an area at which the diffusion plate supporting portion is formed, so that rubbing between the diffusion plate and the diffusion plate supporting portion may be reduced.