Provided are a resin composition including an acryl-based copolymer resin including an alkyl(meth)acrylate-based monomer and an imide-based monomer, additionally copolymerizable with a styrene-based monomer, and a polycarbonate-based resin having a melt index (MI) of 30 g/10 min or more under conditions of a load of 1.2 kg and a temperature of 300° C., a polarizer protective film including the resin composition, and a liquid crystal display including the polarizer protective film. The polarizer protective film according to the present invention has excellent heat resistance, transparency, and optical properties.