Murong Fuyun (Chinese: 慕容伏允; 597–635), regnal name Busabo Khan (Chinese: 步薩鉢可汗), was a ruler of the Xianbei-led dynastic state of Tuyuhun. He first became ruler when his brother Murong Shifu was assassinated in 597, and became one of the longest-ruling monarchs of Tuyuhun. His reign was characterized by numerous major conflicts with the Sui and Tang dynasties. In 635, during a Tang invasion, he was assassinated due to the people's resentment of his hostile attitude toward the Emperor Taizong of Tang that led to the invasion.