Yes you most certainly can. Disney World is a great place to bring your mobility scooter. Many people on a daily basis bring their own when they travel. This helps beat the steep rental fees offered by Disney and other companies in the area. You will find that there is an array of mobility scooters, small and light to heavy duty. If you have a way to transport it, they will accommodate it. Disney has zero tolerance for aggressive use, and they may ask you to not use the scooter if they think there is a safety risk at stake.