Yes, you can absolutely bring deodorant into Disney World or Disneyland, and given the intense Florida and California heat, it is highly recommended. Disney's prohibited items list focuses primarily on safety hazards—such as weapons, glass containers (except for small baby food jars), and loose dry ice—rather than personal hygiene products. Both stick and gel deodorants are perfectly fine to keep in your park bag. If you use an aerosol spray deodorant, it is also permitted, though you should be mindful of the 115-gram (approximately 4-ounce) limit that occasionally applies to certain pressurized containers in high-security zones, though this is rarely enforced for standard toiletries. When passing through the security scanners at the park entrance, your deodorant is unlikely to trigger a bag search unless it is stored in a large metal container that obstructs the view of the scanner. Most veteran Disney travelers suggest bringing a travel-sized version to reapply during long, humid days to stay comfortable during the 12+ hours typically spent in the parks. Just remember that while you can bring it in, you should use it discreetly in the restrooms rather than spraying it in a crowded queue where it might bother other guests with sensitivities.