Ṭhānissaro Bhikkhu is an American Buddhist monk and author. Belonging to the Thai Forest Tradition, he studied for ten years under the forest master Ajahn Fuang Jotiko. Since 1993, he has served as abbot of the Metta Forest Monastery in San Diego County, California—the first monastery in the Thai Forest Tradition in the U.S.—which he cofounded with Ajahn Suwat Suvaco.

The Kammaṭṭhāna Forest Tradition of Thailand, commonly known in the West as the Thai Forest Tradition, is a lineage of Theravada Buddhist monasticism.