Biag ni Lam-ang (English: "The Life of Lam-ang") is an epic poem of the Ilocano people from the Ilocos region of the Philippines. It is notable for being the first Philippine folk epic to be recorded in written form, and was one of only two folk epics documented during the Philippines' Spanish Colonial period, along with the Bicolano epic of Handiong. It is also noted for being a folk epic from a "Christianized" lowland people group (the Ilocano people), with elements incorporated into the storytelling.

Biag ni Lam-ang, though dominated by action and tragedy, nonetheless contained some comedic points. A prominent example is the scene in which Lam-ang was on his way home. He passes by the Amburayan River (identified by some as the biggest river in Ilocos) and decides to bathe. The dirt and blood that fell from his body then causes the death of the river's fish, crabs, and shrimp. As he is bathing, some maidens who were present at the river gladly attend to him.

The tale of Lam-ang, as a story passed on for generations as oral literature and recorded well into the Spanish colonial period, is notable for incorporating Roman Catholic elements into the story, such as references by the characters of Lam-ang and Ines Kannoyan to marriage as a sacrament. Folklorist Mellie Leandicho Lopez notes that "later versions of the epic differ from the early texts due to the addition of more Christian and Spanish elements in the adventures of the Culture hero Lam-Ang."