A temporary protective cover for an electrical box having an open front end. In some embodiments of the invention, the cover is constructed for attachment directly to a circular type electrical box and includes a circular plate of plastic having a pair of flexible wings for use in securing the cover to the electrical box and a pair of punch-outs for use in securing the cover to the electrical box. In some other embodiments of the invention the cover is constructed for attachment to a circular plaster ring which can be attached to a commercial type circular electrical box and include a pair of flexible wings for use in securing the cover to the plaster ring and a pair of punch-outs for use in securing the cover to the plaster ring.