A fire temple in Zoroastrianism is the place of worship for Zoroastrians. Zoroastrians revere fire in any form. In the Zoroastrian religion, fire (see Atar), together with clean water (see Aban), are agents of ritual purity. Clean, white "ash for the purification ceremonies [is] regarded as the basis of ritual life," which, "are essentially the rites proper to the tending of a domestic fire, for the temple [fire] is that of the hearth fire raised to a new solemnity" (Boyce, 1975:455).

For, one "who sacrifices unto fire with fuel in his hand [...], is given happiness." (Yasna 62.1; Nyashes 5.7)

The Zoroastrian cult of fire is much younger than Zoroastrianism itself and appears at approximately the same time as the shrine cult, first evident in the 4th century BCE (roughly contemporaneous with the introduction of Atar as a divinity). There is no allusion to a temple cult of fire in the Avesta proper, nor is there any old Persian language word for one. Moreover, Boyce suggests that the temple cult of fire was instituted in opposition to the image/shrine cults (an alien form of worship inherited from the Babylonians), and "no actual ruins of a fire temple have been identified from before the Parthian period" (Boyce, 1975:454).