Thrasco (fl. 795 – 810) was the Prince (knyaz) of the Obotrite confederation from 795 until his death in 810. He succeeded his father, Witzlaus II, who had been ambushed and killed by the revolting Saxons. Thrasco defeated the Saxons in the battle on Swentana river in 798. He was murdered in Reric in 810. Thrasco had a son, Cedragus, the Obotrite prince from 819 to 826.