The Gas Mask is an item that has appeared in several episodes of Ed, Edd n Eddy. It is generally used by Edd (Jimmy may have one too) in situations that are smelly, or overall repulsive. It was first seen in "Over Your Ed" when Ed's vile odor offended Edd, who promptly put on the gas mask. Its second appearance was in "High Heeled Ed" when Edd and Eddy were in the sewer for the Swamp Ride scam. Edd was repulsed the entire time, and wore both the mask and protective overalls the entire time he was in the sewer. The mask's third appearance was in "Thick as an Ed" when Edd tried to dispose of Ed's lucky cheese chunk, thus prompting him to wear it as to avoid it's hideous odor. The mask's fourth appearance was in "Cleanliness Is Next to Edness" when Jimmy had Jonny wear it while dousing his new wig with hairspray.
- Judging by the design, it is probably a civilian issue gas mask as the filter cartridge is in the front, versus military issue being on the side.
- When Edd was seen going into the sewer in "Boom Boom Out Goes the Ed," he was not wearing it even though he is repulsed by the sewer.
- Similar masks that appear in the series include Captain Melonhead's watermelon mask and Splinter the Wonderwood's mask ("Robbin' Ed"), the chimp mask ("See No Ed"), the masks that the kids made of Eddy's bad school photo ("Smile for the Ed"), and the tiki mask that appears on the wall in Ed's room.