A method of manufacturing an organic light emitting display apparatus using a donor mask. The donor mask includes a base substrate, a light to heat conversion layer provided on the base substrate, and a reflection layer disposed between the base substrate and the light to heat conversion layer and comprising a through hole corresponding to a first transfer region, a non-transfer region having a first thickness and a second transfer region having a second thickness smaller than the first thickness, and the organic light emitting display apparatus using the same.