Yax Nuun Ahiin I, also known as Curl Snout and Curl Nose (died 17 June 404?), was a 4th-century ruler of the Maya city of Tikal. His name when transcribed is YAX-?-AH:N, translated "First ? Crocodile". He took the throne on 12 September 379, and reigned until his death. He is referred to by the Mayan title ajaw, meaning lord.