Armenians in Istanbul
| Year | TOTAL | Armenians | % |
| 1478 | 100,000 – 120,000 | 5,000–6,000 | ~5% |
| 1844 | 891,000 | 160,000–222,000 | 18–25% |
| 1880s | 250,000 | ||
| 1885 | 873,565 | 156,861 | 18% |
| 1913 | 1,125,000 | 163,670 | 15% |
| 2011 | 13,483,052 | 50,000 – 70,000 | 0.4–0.5% |
| 2021 | 15,840,900 | 50,000 – 70,000 | 0.3–0.4% |
Armenians in Istanbul are a major part of the Turkish Armenian community and historically one of the largest ethnic minorities of Istanbul, Turkey. The city is often referred to as Bolis by Armenians, which is derived from the ending of the historical name of the city Constantinople.
Today, most estimations put the number of Armenian-Turkish citizens in Istanbul at 50,000, 60,000 or 70,000. They constitute the largest Christian and non-Muslim minority in Istanbul, as well as in Turkey. They are not considered part of the Armenian Diaspora by the Ministry of Diaspora, since they have been living in their historical homeland for more than four thousand years.
In addition to local ethnic Armenians who are Turkish citizens, there are also between 10,000 and 30,000 recent illegal immigrants from Armenia in Istanbul.
History
Armenians have been living in Constantinople since the fourth century. An Armenian parish was established in 572. Armenians flourished in Byzantium and there were many Byzantine emperors of Armenian origin.In early 17th-century, according to traveler Simeon of Poland, there were five Armenian churches in Constantinople at the time: Surp Nikoghayos, Surp Asdvadzadzin, and Surp Sarkis in the neighborhood of Langa, another church in Balat, and Surp Georg in Sulumanastır. Apart from monks, there were 4–5 vardapets, 3 bishops, and over 100 priests in the city. He put the number of native Armenian households only at about 80, while Anatolian Armenian households who took refuge in Constantinople, Galata, and Üsküdar after the Celali rebellions, were more than 40 thousand.
The Armenian community was made up of three religious denominations: Catholic, Protestant, and Apostolic, the Church of the vast majority of Armenians. The wealthy, Constantinople-based Amira class, a social elite whose members included the Duzians, the Balyans and the Dadians.
The Ottoman Empire's Armenian genocide during World War I began with the deportation of 250 prominent Armenians from Constantinople.