Mahadharmarakkhita (Sanskrit: Mahadharmaraksita, literally "Great protector of the Dharma") was a Greek (in Pali:"Yona", Sanskrit: "Yavana", lit. "Ionian") Buddhist master, who lived during the 2nd century BCE during the reign of the Indo-Greek king Menander.
In the Mahavamsa, a key Pali historical text, he is recorded as having travelled from “Alasandra” (thought to be Alexandria of the Caucasus, around 150 kilometers north of today's Kabul, or possibly Alexandria of the Arachosians), with 30,000 monks for the dedication ceremony of the Maha Thupa ("Great stupa") at Anuradhapura in Sri Lanka, when it was completed shortly after the death of the Sri Lankan king Dutthagamani Abhaya (r. 161 - 137 BCE).