This disclosure describes, in part, soundproof covers for voice-controlled devices. For instance, a first portion of a soundproof cover may include a soundproof material that does not allow outside sound to travel to microphone(s) of a voice-controlled device. A second portion of the soundproof cover may include a material and/or openings that allows interior sound output by speaker(s) of the voice-controlled device to travel outside of the soundproof cover. In some instances, such as when the voice-controlled device includes a display, a third portion of the soundproof cover may include material and/or an opening that allows the display to be visible.