Armenians in Russia or Russian Armenians (Armenian: Հայերը Ռուսաստանում, romanized: Hayery Rrusastanum; Russian: Армяне в России, romanized: Armyane v Rossii) are one of the country's largest ethnic minorities and the largest Armenian diaspora community outside Armenia. The 2010 Russian census recorded 1,182,388 Armenians in the country. Various figures estimate that the ethnic Armenian population in Russia is actually more than 2 million. Armenians populate various regions, including Moscow, Saint Petersburg, Krasnodar Krai in the North Caucasus and as far as Vladivostok in the East.

There has been an Armenian presence in Russia since the Late Middle Ages, when various merchants and artisans ventured west to the Crimea and the northern Caucasus in order to set up trade ties and conduct commerce.

The relationship between Armenians and Russian imperial authorities was complex, shaped as often by parallel interests as competing objectives. Large Armenian communities resided both in the Caucasus and in Russian cities well before the modern era. After the destruction of the last remaining independent Armenian states in the Middle Ages, the nobility disintegrated, leaving Armenian society composed of a mass of peasants plus a middle class who were either craftsmen or merchants. Such Armenians were to be found in most towns of Transcaucasia; indeed, at the beginning of the 19th century they formed the majority of the population in cities such as Tbilisi. Armenian merchants conducted their trade across the world and many had set up base within Russia. In 1778, Catherine the Great invited Armenian merchants from the Crimea to Russia and they established a settlement at Nakhichevan-on-Don, near Rostov-on-Don. The Russian ruling classes welcomed the Armenians' entrepreneurial skills as a boost to the economy, but they also regarded them with some suspicion. The image of the Armenian as a "wily merchant" was already widespread. Russian nobles derived their income from their estates worked by serfs and, with their aristocratic distaste for engaging in business, they had little understanding or sympathy for the way of life of mercantile Armenians. Due to the Armenian genocide, over 300 thousand Armenians migrated to the Russian Empire, specifically within Georgia and Armenia.

Nevertheless, middle-class Armenians prospered under Russian rule and they were the first to seize the new opportunities and transform themselves into a prosperous bourgeoisie when capitalism and industrialisation came to Transcaucasia in the later half of the 19th century. The Armenians more easily adapted to the new economic circumstances than their neighbours in Transcaucasia, the Georgians and the Azeris. They became the most powerful element in the municipal life of Tbilisi, the heart of the tsarist administration of the Caucasus as well as its economic center. Armenian entrepreneurs were quick to engage the oil boom which began in Transcaucasia in the 1870s, making investments in the oil fields in Baku in Azerbaijan and the refineries of Batumi on the Black Sea coast. All this meant that the tensions between Armenians, Georgians and Azeris in Russian Transcaucasia were not simply ethnic or religious in nature but also were shaped by social and economic considerations. Nevertheless, despite the stereotype of the typical Armenian as a successful businessman, at the end of the 19th century 80 percent of Russian Armenians were still peasants working the land.

Many Armenians were deported around the Soviet Union states, Armenians were in many of the existing Soviet Republics, there still is a sizable population of Armenian's in post-Soviet countries, many whom still speak Russian.

A wave of Armenian's from Middle Eastern countries between 1946-1949 specifically from, Syria, Lebanon, and Iraq were called to migrate to the Soviet Union for a better life, due to many of these people were ancestors and victims of the Armenian genocide and displaced them from their homelands in the Ottoman Empire. Many whom immigrated faced discrimination, many of these people have assimilated into the modern day Eastern Armenian population, and do not speak the Western Armenian dialect or now speak have a diglossic situation between Western Armenian dialects in informal usage and an Eastern Armenian standard.

This includes Iranian Armenians, who left Iran to Soviet Armenia, many have again assimilated into the Armenian population.

According to the Union of Russian Armenians, there are 2.5 million Armenians living in Russia today. According to the same source, about 850,000 are immigrants from Armenia, 350,000 from Azerbaijan and 250,000 from Georgia, including 100,000 from Abkhazia and 180,000 from Central Asia, mostly Tajikistan and Turkmenistan.