Mangsong Mangtsen (), Trimang Löntsen or Khri-mang-slon-rtsan (r. 655–676 CE) succeeded to the Tibetan throne either after the death of his father Gungsong Gungtsen, or of his grandfather the 33rd Tibetan king Songtsen Gampo. He became the 34th king of Tibet's Yarlung Dynasty, and the second king during the Tibetan Empire era (c. 637-848).
