The invention provides an optical compensating film for a liquid crystal display, and belongs to the technical field of liquid crystal displaying. The optical compensating film comprises a first polaroid, a second polaroid, a film A and a film C, wherein the first polaroid and the second polaroid are respectively arranged on two sides of a liquid crystal panel; the film A and the film C are arranged between the liquid crystal panel and the first polaroid or between the liquid crystal panel and the second polaroid; the compensation value of in-plane optical path difference of the film A is in a range between 92 nanometers and 184 nanometers; and the compensation value of optical path difference in the thickness direction of the film A is in a range between 46 nanometers and 92 nanometers. According to the optical compensating film, the dark-state light leakage distribution and the contrast of the display are improved. The invention also provides a liquid crystal display comprising the optical compensating film.