The present disclosure provides a 3D display assembly and a 3D display apparatus including the 3D display assembly. The 3D display assembly comprises a display panel, a 3D device and a spacing layer between the display panel and the 3D device, the display panel, the 3D device and the spacing layer overlapping with each other, wherein a first protrusion which extends beyond edges of the display panel and the 3D device is formed on at least one side of the spacing layer other than its side facing towards the display panel and its side facing towards the 3D device. The protrusion is used to support the entire display assembly to avoid misalignment between the display panel and the 3D device due to undue weight of the spacing layer.