Zandik (Middle Persian: 𐭦𐭭𐭣𐭩𐭪) is a Zoroastrian term conventionally interpreted as heretic in a narrow sense, or, in a wider sense, for a person with any belief or practice that ran contrary to Sassanid-mediated Zoroastrian orthodoxy. In several now-obsolete studies related to Zoroastrianism, the word was also speculated to be the proper name of a particular (but hypothetical) priestly tradition that embraced Zurvanite doctrine.