The object of the present invention is to provide an optical film having a novel configuration, in which the film has superior performance and is thinner, and a production step therefor is carried out more efficiently, a method for producing the optical film, and a polarizing plate. An optical film of the present invention includes a positive A-plate and a positive C-plate, in which the Re(450), Re(550), and Re(650) of the positive A-plate satisfy the relationship of Re(450)<=Re(550)<=Re(650), the positive A-plate is formed of a cured product of a composition including the liquid crystal compound A, and the positive C-plate is formed of a cured product of a composition including the liquid crystal compound C. An optical film includes two layers of positive A-plates and positive C-plates, and at least any layer of the two layers of the positive A-plate is formed by a composition containing a cross-linked polymer. The polarizing plate includes a linear polarizing film and any one of the optical films. The method for producing the optical film comprises: coating the composition including the liquid crystal compound C on the surface of the positive A-plate.