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Mithra (Avestan: 𐬀𐬭𐬚𐬌𐬨 Miθra, Old Persian: 𐎷𐎰𐎼 Miça) is the Zoroastrian angelic divinity (yazata) of covenant and oath. In addition to being the divinity of contracts, Mithra is also a judicial figure, an all-seeing protector of Truth, and the guardian of cattle, the harvest and of The Waters.
The term Mithra is from the Avestan language. In Middle Iranian languages (Middle Persian, Parthian etc.), Mithra became Mihr, from which Modern Persian مهر Mihr, Northern Pashto لمر Nwar, Waziri Pashto ميېر Myer and Armenian Mihr/Mher ultimately derive.
The Romans attributed their Mithraic Mysteries (the mystery religion known as Mithraism) to Persian or Zoroastrian sources relating to Mithra. However, since the early 1970s, the dominant scholarship has noted dissimilarities, and those mysteries are now qualified as a distinct Roman product.
Together with the Vedic common noun mitra, the Avestan common noun miθra derives from proto-Indo-Iranian *mitra, from the root mi- "to bind", with the "tool suffix" -tra- "causing to." Thus, etymologically mitra/miθra means "that which causes binding", preserved in the Avestan word for "covenant, contract, oath".
Mithra is described in the 
The Khorda Avesta (Book of Common Prayer) also refer to Mithra in the Litany to the Sun, "Homage to Mithra of wide cattle pastures,"(Khwarshed Niyayesh 5), "Whose word is true, who is of the assembly, Who has a thousand ears, the well-shaped one, Who has ten thousand eyes, the exalted one, Who has wide knowledge, the helpful one, Who sleeps not, the ever wakeful. We sacrifice to Mithra, The lord of all countries, Whom Ahura Mazda created the most glorious, Of the supernatural yazads. So may there come to us for aid, Both Mithra and Ahura, the two exalted ones,"(Khwarshed Niyayesh 6-7), "I shall sacrifice to his mace, well aimed against the skulls of the Daevas,"(Khwarshed Niyayesh 15). Some recent theories have claimed Mithra represents the sun itself, but the Khorda Avesta refers to the sun as a separate entity - as it does with the moon, with which the sun has "the best of friendships,"(Khwarshed Niyayesh 15)
Like most other divinities, Mithra is not mentioned by name in the Gathas, the oldest texts of Zoroastrianism and generally attributed to Zoroaster himself. Mithra also does not appear by name in the Yasna Haptanghaiti, a seven-verse section of the Yasna liturgy that is linguistically as old as the Gathas. The lack of Mithra's presence in these texts was once a cause of some consternation amongst Iranists. An often repeated speculation of the first half of the 20th century was that the lack of any mention (i.e., Zoroaster's silence) of Mithra in these texts implied that Zoroaster had rejected Mithra. This ex silentio speculation is no longer followed. Building on that speculation was another series of speculations, which postulated that the reason why Zoroaster did not mention Mithra was because the latter was the supreme god of a bloodthirsty group of daeva-worshipers that Zoroaster condemned. However, "no satisfactory evidence has yet been adduced to show that, before Zoroaster, the concept of a supreme god existed among the Iranians, or that among them Mithra – or any other divinity – ever enjoyed a separate cult of his or her own outside either their ancient or their Zoroastrian pantheons."
As a member of the ahuric triad, a feature that only Ahura Mazda and Ahura Berezaiti (Apam Napat) also have, Mithra is an exalted figure. As the divinity of contract, Mithra is undeceivable, infallible, eternally watchful, and never-resting. Mithra is additionally the protector of cattle, and his stock epithet is "of wide pastures." He is guardian of the waters and ensures that those pastures receive enough of it.
Together with Rashnu "Justice" and Sraosha "Obedience", Mithra is one of the three judges at the Chinvat bridge, the "bridge of separation" that all souls must cross. Unlike Sraosha, Mithra is not however a psychopomp. Should the good thoughts, words and deeds outweigh the bad, Sraosha alone conveys the soul across the bridge.
The Avestan hymn to Mithra (Yasht 10) is the longest, and one of the best preserved, of the Yashts.
Mithra is invoked in the inscriptions of two Achaemenid emperors.
In Artaxerxes II's trilingual (Old Persian, Elamite and Babylonian) inscription at Susa (A2Sa) and Hamadan (A2Hc), which have the same text, the emperor appeals to "Ahuramazda, Anahita, and Mithra protect me against all evil", and in which he beseeches them to protect what he has built.
Although the Behistun inscription of Darius invokes Ahuramazda and "the other gods who are", this inscription of Artaxerxes II is remarkable as no Achaemenid king before him had invoked any but Ahura Mazda alone by name. Boyce suggests that the reason for this was that Artaxerxes had chosen Anahita and Mithra as his patron/protector divinities.
Mithra is invoked again in the single known inscription of Artaxerxes III, A3Pa, found at Persepolis. In that inscription, that emperor too appeals to "Ahuramazda and the god Mithra preserve me, my country, and what has been built by me."
In the Zoroastrian calendar, the sixteenth day of the month and the seventh month of the year are dedicated to, and under the protection of, Mithra. (The Iranian civil calendar of 1925 adopted Zoroastrian month-names, and as such also has the seventh month of the year named 'Mihr'). The position of the sixteenth day and seventh month reflects Mithra's rank in the hierarchy of the divinities; the sixteenth day and seventh month are respectively the first day of the second half of the month and the first month of the second half of the year. The day on which the day-name and month-name dedications intersect is (like all other such intersections) dedicated to the divinity of that day/month, and is celebrated with a Jashan (from Avestan Yasna, "worship") in honor of that divinity. In the case of Mithra, this was Jashan-e Mihragan, or just Mihragan in short.
While Mithra is not the divinity of the Sun in Zoroastrian scripture (or in Indian scripture either), this being the role of Hvare.khshaeta (literally "radiant Sun", whence also Middle Persian Khorshed for the Sun), in Zoroastrian/Iranian tradition, Mithra became the divinity of the Sun. How, when or why this occurred is uncertain, but it is commonly attributed to a conflation with the Babylonian Shamash, who – in addition to being a Sun god – was a judicial figure like Mithra. In the Hellenistic era (i.e., in Seleucid and Parthian times), Mithra also seems to have been conflated with Apollo, who – like Mithra – was an all-seeing divinity of the truth.
Royal names incorporating Mithra's (e.g., "Mithradates") appear in the dynasties of Parthia, Armenia, and in Anatolia, in Pontus and Cappadocia.
Persian and Parthian-speaking Manichaeans used the name of Mithra current in their time (Mihryazd, q.e. Mithra-yazata) for two different Manichaean angels.
- The first, called Mihryazd by the Persians, was the "The Living Spirit" (Aramaic rūḥā ḥayyā), a savior-figure who rescues the "First Man" from the demonic Darkness into which he had plunged.
- The second, known as Mihr or Mihr yazd among the Parthians, is "The Messenger" (Aramaic īzgaddā), likewise a savior figure, but one concerned with setting up the structures to liberate the Light lost when the First Man had been defeated.
The second figure mentioned above, the Third Messenger, was the helper and redeemer of mankind, and identified with another Zoroastrian divinity, Narisaf (derived from Pahlavi Narsēh from Avestan Nairyō.saȵhō, meaning 'potent utterance', the name of a yazata). Citing Boyce, Sundermann remarks, "It was among the Parthian Manicheans that Mithra as a sun god surpassed the importance of Narisaf as the common Iranian image of the Third Messenger; among the Parthians the dominance of Mithra was such that his identification with the Third Messenger led to cultic emphasis on the Mithraic traits in the Manichaean god."
Unrelated to these Mihrs are Parthian and Sogdian Mytr or Mytrg. Alhough sharing linguistic roots with the name Mithra, Werner Sundermann established that those names denote Manicheanisms equivalent of Maitreya.
- Beck, Roger (2002- 7 -20). "Mithraism". Encyclopaedia Iranica, Online Edition. Retrieved 2012-09-07.
- Boyce 2001, p. 243, n.18.
- Sundermann, Werner (1979), Bianchi, Ugo, ed., "The Five Sons of the Manichaean God Mithra", Mysteria Mithrae: Proceedings of the International Seminar on the Religio-Historical Character of Roman Mithraism (Leiden: Brill)
- Boyce, Mary. (1962) On Mithra in the Manichaean Pantheon. In Henning, Walter B. and Yarshater, Ehsan (eds.), A Locust's Leg: Studies in Honour of S. H. Taqizadeh, London
- Sundermann, Werner (2002), "Mithra in Manicheism",
- Boyce, Mary (2001), "Mithra the King and Varuna the Master", Festschrift für Helmut Humbach zum 80., Trier: WWT, pp. 239–257
- Malandra, William (1983), An Introduction to Ancient Iranian Religion, Minneapolis: University of Minnesota Press,
- Schmidt, Hans-Peter (2006), "Mithra i: Mithra in Old Indian and Mithra in Old Iranian", Encyclopaedia Iranica, OT 10, New York: iranica.com.
- Jacobs, Bruno (2006), "Mithra", Iconography of Deities and Demons in the Ancient Near EastIconography of Mithra , (Electronic Pre-Publication), Leiden: U Zürich/Brill.
- Dumezil, Georges (2008), Mitra-Varuna: An Essay on Two Indo-European Representations of Sovereignty. New York: Zone Books.