Boroldai (or Burulday, Borolday), also known as Burundai, (Cyrillic: Боролдай) (died 1263) was a notable Mongol general of the mid 13th century. He participated in the Mongol invasion of Russia and Europe from 1236 to 1242[1] and other Mongol raids of Europe until 1263.
The clan of Borolday is not clear. He was probably from one of four tribes that Genghis Khan (1162–1227) assigned to his eldest son, Jochi: the Sanchi'ud (or Salji'ud), Keniges, Uushin, and Je'ured clans.