Airbag cushion assemblies comprising internal stabilizers and related methods. Some embodiments may comprise an airbag cushion comprising a first side and a second side opposite from the first side and a hub comprising a hub opening configured to be coupled with an inflator so as to receive inflation gases during deployment of the airbag cushion through the hub opening. A stabilizer, such as, in some embodiments, a diffuser or another inflatable structure, may be positioned within the airbag cushion and may be non-releasably coupled with the airbag cushion along at least a portion of the first side, along at least a portion of the second side, and adjacent to the hub opening.