An optical film includes a negative C-plate, a light diffusion layer on the negative C-plate, and a polarizer on the negative C-plate where the polarizer includes a linear polarizer and a retardation plate on the linear polarizer, the light diffusion layer includes a first light-transmissive base and a plurality of first rods that have a different refractive index from that of the first light-transmissive base and are aligned at a first inclination angle within the first light-transmissive base, and the negative C-plate has an x-axis refractive index Nx, a y-axis refractive index Ny, and a z-axis refractive index Nz, where “Nx>Nz” and “Ny>Nz.”