هندوایرانیان یا هندوایرانیها -که گاه با آریاییها یکی گرفته میشود- نام یک گروه قومی بوده که هندوآریاییها، ایرانیها (شامل شاخهٔ شرقی یعنی سکاها، خوارزمیان، سغدیان، تخاریان و ... و شاخهٔ غربی شامل مادها، پارس ها و پارت ها)، داردها و نورستانی ها از آنها منشعب شدهاند. اینان گویشور زبانهای هندوایرانی بودند که شاخهای بزرگ از زبانهای هندواروپایی است. نیاکان هندوایرانیها، نیاهندواروپاییان بودند. جمعیت هندوایرانیها بیش از یک و نیم میلیارد نفر است. خبرگزاری آناتولی ترکیه در اینفوگرافیکی که در ۲۹ ام ماه آوریل سال ۲۰۱۷ میلادی (اردیبهشت ماه سال ۱۳۹۶ خورشیدی) به مناسبت سفر طیب اردوغان به هند تهیه کرده بود، جمعیت هند را شامل ۷۲ درصد هندوآریایی و ۲۵ درصد دراویدی برشمرده بود که بیش از ۹۵۰ میلیون نفر از مردم هند در سال ۲۰۱۷ هندوآریایی هستند. 
متاخرترین زمانی که میتوان برای گسترش هندوایرانیها به نواحی مختلف تعیین کرد، حدود سدهٔ ۱۴ قبل از میلاد است. بر طبق شواهدی از این دست، پژوهشگران، آغاز پراکندگی هندوایرانیان را نیمه نخست هزارهٔ دوم پیش از میلاد در نظر میگیرند. در طی هزاره دوم و اوایل هزارهٔ نخست پیش از میلاد، گروههای مختلفی از هندوایرانیها به تدریج به نقاطی در آسیای مرکزی و شمال افغانستان پراکنده شدند. در واقع به تدریج از استپها به سرزمینهای جنوبی نقل مکان کردند. از این رو در شمال باختر (Bactria) سه فرهنگ مختلف پدید آمد؛ فرهنگ باختر-مرو، فرهنگ آندرونو و فرهنگ بیشکنت(Bishkent).
فرهنگی باستانشناختیک ذیل در پیوند با هندوایرانیانند:
Wikipedia contributors, "Indo-Iranians," Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/w/index.php?title=Indo-Iranians&oldid=695469657 (accessed December 22, 2015).
Indo-Iranian peoples, also known as Indo-Iranic peoples by scholars, and sometimes as Arya or Aryans from their self-designation, were an ethno-linguistic group who brought the Indo-Iranian languages, a major branch of the Indo-European language family, to major parts of Eurasia.
The term Aryan has been used historically to denote the Indo-Iranians, because Arya is the self designation of the ancient speakers of the Indo-Iranian languages, specifically the Iranian and the Indo-Aryan peoples, collectively known as the Indo-Iranians. Some scholars now use the term Indo-Iranian to refer to this group, while the term "Aryan" is used to mean "Indo-Iranian" by other scholars such as Josef Wiesehofer, Will Durant, and Jaakko Häkkinen. Population geneticist Luigi Luca Cavalli-Sforza, in his 1994 book The History and Geography of Human Genes, also uses the term Aryan to describe the Indo-Iranians.
The early Indo-Iranians are commonly identified with the descendants of the Proto-Indo-Europeans known as the Sintashta culture and the subsequent Andronovo culture within the broader Andronovo horizon, and their homeland with an area of the Eurasian steppe that borders the Ural River on the west, the Tian Shan on the east (where the Indo-Iranians took over the area occupied by the earlier Afanasevo culture), and Transoxiana and the Hindu Kush on the south.
Based on its use by Indo-Aryans in Mitanni and Vedic India, its prior absence in the Near East and Harappan India, and its 19th–20th century BCE attestation at the Andronovo site of Sintashta, Kuzmina (1994) argues that the chariot corroborates the identification of Andronovo as Indo-Iranian.[note 1] Anthony & Vinogradov (1995) dated a chariot burial at Krivoye Lake to about 2000 BCE, and a Bactria-Margiana burial that also contains a foal has recently been found, indicating further links with the steppes.
Historical linguists broadly estimate that a continuum of Indo-Iranian languages probably began to diverge by 2000 BC, if not earlier,:38–39 preceding both the Vedic and Iranian cultures. The earliest recorded forms of these languages, Vedic Sanskrit and Gathic Avestan, are remarkably similar, descended from the common Proto-Indo-Iranian language. The origin and earliest relationship between the Nuristani languages and that of the Iranian and Indo-Aryan groups is not completely clear.
Two-wave models of Indo-Iranian expansion have been proposed by Burrow (1973) and Parpola (1999). The Indo-Iranians and their expansion are strongly associated with the Proto-Indo-European invention of the chariot. It is assumed that this expansion spread from the Proto-Indo-European homeland north of the Caspian sea south to the Caucasus, Central Asia, the Iranian plateau, and Northern India. They also expanded into Mesopotamia and Syria and introduced the horse and chariot culture to this part of the world. Sumerian texts from EDIIIb Girsu (2500–2350 BC) already mention the 'chariot' (gigir) and Ur III texts (2150–2000 BC) mention the horse (anshe-zi-zi).
First wave – Indo-Aryans
The Mitanni of Anatolia
The Mitanni, a people known in eastern Anatolia from about 1500 BC, were of mixed origins: a Hurrian-speaking majority was dominated by a non-Anatolian, Indo-Aryan elite.:257 There is linguistic evidence for such a superstrate, in the form of:
In particular, Kikkuli's text includes words such as aika "one" (i.e. a cognate of the Indo-Aryan eka), tera "three" (tri), panza "five" (pancha), satta "seven", (sapta), na "nine" (nava), and vartana "turn around", in the context of a horse race (Indo-Aryan vartana). In a treaty between the Hittites and the Mitanni, the Ashvin deities Mitra, Varuna, Indra, and Nasatya are invoked. These loanwords tend to connect the Mitanni superstrate to Indo-Aryan rather than Iranian languages – i.e. the early Iranian word for "one" was aiva.
Indian subcontinent – Vedic culture
The standard model for the entry of the Indo-European languages into the Indian subcontinent is that this first wave went over the Hindu Kush, either into the headwaters of the Indus and later the Ganges. The earliest stratum of Vedic Sanskrit, preserved only in the Rigveda, is assigned to roughly 1500 BC.:258 From the Indus, the Indo-Aryan languages spread from c. 1500 BC to c. 500 BC, over the northern and central parts of the subcontinent, sparing the extreme south. The Indo-Aryans in these areas established several powerful kingdoms and principalities in the region, from south eastern Afghanistan to the doorstep of Bengal. The most powerful of these kingdoms were the post-Rigvedic Kuru (in Kurukshetra and the Delhi area) and their allies the Pañcālas further east, as well as Gandhara and later on, about the time of the Buddha, the kingdom of Kosala and the quickly expanding realm of Magadha. The latter lasted until the 4th century BC, when it was conquered by Chandragupta Maurya and formed the center of the Mauryan empire.
In eastern Afghanistan and southwestern Pakistan, whatever Indo-Aryan languages were spoken there were eventually pushed out by the Iranian languages. Most Indo-Aryan languages, however, were and still are prominent in the rest of the Indian subcontinent. Today, Indo-Aryan languages are spoken in India, Pakistan, Bangladesh, Nepal, Sri Lanka, Fiji, Suriname and the Maldives.
Second wave – Iranians
The second wave is interpreted as the Iranian wave.:42–43 The first Iranians to reach the Black Sea may have been the Cimmerians in the 8th century BC, although their linguistic affiliation is uncertain. They were followed by the Scythians, who are considered a western branch of the Central Asian Sakas. Sarmatian tribes, of whom the best known are the Roxolani (Rhoxolani), Iazyges (Jazyges) and the Alani (Alans), followed the Scythians westwards into Europe in the late centuries BC and the 1st and 2nd centuries AD (The Age of Migrations). The populous Sarmatian tribe of the Massagetae, dwelling near the Caspian Sea, were known to the early rulers of Persia in the Achaemenid Period. At their greatest reported extent, around 1st century AD, the Sarmatian tribes ranged from the Vistula River to the mouth of the Danube and eastward to the Volga, bordering the shores of the Black and Caspian seas as well as the Caucasus to the south. In the east, the Saka occupied several areas in Xinjiang, from Khotan to Tumshuq.
The Medians, Persians and Parthians begin to appear on the Iranian plateau from c. 800 BC, and the Achaemenids replaced Elamite rule from 559 BC. Around the first millennium AD, Iranian groups began to settle on the eastern edge of the Iranian plateau, on the mountainous frontier of northwestern and western Pakistan, displacing the earlier Indo-Aryans from the area.
In Eastern Europe, the Iranians were eventually decisively assimilated (e.g. Slavicisation) and absorbed by the Proto-Slavic population of the region, while in Central Asia, the Turkic languages marginalized the Iranian languages as a result of the Turkic expansion of the early centuries AD. Extant major Iranian languages are Persian, Pashto, Kurdish, and Balochi besides numerous smaller ones. Ossetian, primarily spoken in North Ossetia and South Ossetia, is a direct descendant of Alanic, and by that the only surviving Sarmatian language of the once wide-ranging East Iranian dialect continuum that stretched from Eastern Europe to the eastern parts of Central Asia.
Archaeological cultures associated with Indo-Iranian expansion include:
Parpola (1999) suggests the following identifications:
The Indo-European language spoken by the Indo-Iranians in the late 3rd millennium BC was a Satem language still not removed very far from the Proto-Indo-European language, and in turn only removed by a few centuries from Vedic Sanskrit of the Rigveda. The main phonological change separating Proto–Indo-Iranian from Proto–Indo-European is the collapse of the ablauting vowels *e, *o, *a into a single vowel, Proto–Indo-Iranian *a (but see Brugmann's law). Grassmann's law and Bartholomae's law were also complete in Proto–Indo-Iranian, as well as the loss of the labiovelars (kw, etc.) to k, and the Eastern Indo-European (Satem) shift from palatized k' to ć, as in Proto–Indo-European *k'ṃto- > Indo-Iran. *ćata- > Sanskrit śata-, Old Iran. sata "100".
Despite the introduction of later Hindu and Zoroastrian scriptures, Indo-Iranians shared a common inheritance of concepts including the universal force *Hṛta- (Sanskrit rta, Avestan asha), the sacred plant and drink *sawHma- (Sanskrit Soma, Avestan Haoma) and gods of social order such as *mitra- (Sanskrit Mitra, Avestan and Old Persian Mithra, Miϑra) and *bʰaga- (Sanskrit Bhaga, Avestan and Old Persian Baga). Proto-Indo-Iranian religion is an archaic offshoot of Indo-European religion. From the various and dispersed Indo-Iranian cultures, a set of common ideas may be reconstructed from which a common, unattested proto-Indo-Iranian source may be deduced.
Beliefs developed in different ways as cultures separated and evolved. For example, the cosmo-mythology of the peoples that remained on the Central Asian steppes and the Iranian plateau is to a great degree unlike that of the Indians, focused more on groups of deities (*daiva and *asura) and less on the divinities individually. Indians were less conservative than Iranians in their treatment of their divinities, so that some deities were conflated with others or, conversely, aspects of a single divinity developed into divinities in their own right. By the time of Zoroaster, Iranian culture had also been subject to the upheavals of the Iranian Heroic Age (late Iranian Bronze Age, 1800–800 BCE), an influence that the Indians were not subject to.
Sometimes certain myths developed in altogether different ways. The Rig-Vedic Sarasvati is linguistically and functionally cognate with Avestan *Haraxvaitī Ārəduuī Sūrā Anāhitā. In the Rig-Veda (6,61,5–7) she battles a serpent called Vritra, who has hoarded all of the Earth's water. In contrast, in early portions of the Avesta, Iranian *Harahvati is the world-river that flows down from the mythical central Mount Hara. But *Harahvati does no battle — she is blocked by an obstacle (Avestan for obstacle: vərəϑra) placed there by Angra Mainyu.
The following is a list of cognate terms that may be gleaned from comparative linguistic analysis of the Rigveda and Avesta. Both collections are from the period after the proposed date of separation (ca. 2nd millennium BCE) of the Proto-Indo-Iranians into their respective Indic and Iranian branches.
R1a1a (R-M17 or R-M198) is the sub-clade most commonly associated with Indo-European speakers. Most discussions purportedly of R1a origins are actually about the origins of the dominant R1a1a (R-M17 or R-M198) sub-clade. Data so far collected indicates that there are two widely separated areas of high frequency, one in the Indian subcontinent, around North India, and the other in Eastern Europe, around Poland and Ukraine. The historical and prehistoric possible reasons for this are the subject of on-going discussion and attention amongst population geneticists and genetic genealogists, and are considered to be of potential interest to linguists and archaeologists also.
Out of 10 human male remains assigned to the Andronovo horizon from the Krasnoyarsk region, 9 possessed the R1a Y-chromosome haplogroup and one C-M130 haplogroup (xC3). mtDNA haplogroups of nine individuals assigned to the same Andronovo horizon and region were as follows: U4 (2 individuals), U2e, U5a1, Z, T1, T4, H, and K2b.
A 2004 study also established that during the Bronze Age/Iron Age period, the majority of the population of Kazakhstan (part of the Andronovo culture during Bronze Age), was of west Eurasian origin (with mtDNA haplogroups such as U, H, HV, T, I and W), and that prior to the 13th–7th century BC, all Kazakh samples belonged to European lineages.