There are nine reindeer on Santa's sleigh, including Rudolph, Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Donder, and Blitzen. These reindeer are known for their speed and endurance, enabling them to pull Santa's sleigh and deliver presents to children around the world in a single night. The reindeer's names and their positions on the sleigh have become iconic symbols of the holiday season and are often depicted in popular culture.