A method of manufacturing an organic light emitting device that readily increases the characteristics of an intermediate layer having an organic light emitting layer, and a method of manufacturing an organic light emitting display apparatus. The method of manufacturing an organic light emitting device includes preparing a substrate having a first electrode; disposing the substrate on a base member; disposing a donor film that covers the substrate and contacts the base member exposed around the substrate; combining the base member and the donor film; forming an intermediate layer having an organic light emitting layer on the first electrode by performing a transfer process in a laser thermal transfer apparatus after placing the base member and the donor film combined with each other with the substrate interposed therebetween in the laser thermal transfer apparatus; and forming a second electrode on the intermediate layer.