Santa Claus' reindeer is a team of flying reindeer traditionally held to pull the sleigh of Santa Claus and help him deliver Christmas gifts. The commonly cited names of the reindeer are Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Donder (or Donner), and Blitzen. They are based on those used in the 1823 poem "A Visit from St. Nicholas", arguably the basis of reindeer's popularity as Christmas symbols, where Donner and Blitzen were originally called Dunder and Blixem respectively.
The subsequent popularity of the Christmas song "Rudolf the Red-Nosed Reindeer" has led to Rudolf often joining the list.