Provided are an organic light-emitting display apparatus and a method of manufacturing the same. The organic light-emitting display apparatus includes a first substrate; an organic light-emitting device provided on the first substrate and including a first electrode, a second electrode, and an intermediate layer positioned between the first electrode and the second electrode; a second substrate covering the organic light-emitting device and disposed to face the first substrate; and a sealant bonding the first substrate and the second substrate, wherein at least a portion of the sealant is a intermixing region which is formed as an inorganic material permeates an organic material.