Celebrations also took place in other cities, including Cologne and Frankfurt.
In the UK, Erdoğan supporters gathered at London's famous Hyde Park, waving flags and even performing the traditional Turkish halay dance.
Several French cities also saw massive celebrations, including Strasbourg, where some 1,500 people gathered outside the Turkish Consulate.
In the Netherlands, celebrations were held at Rotterdam's Hofplein square, while revelers also came out in the Swiss city of Zurich.
Turkish nationals were also out in Balkan countries, including Bosnia and Herzegovina, Serbia, Montenegro, and North Macedonia.
Erdoğan's reelection was confirmed by the chairman of the Türkiye's Supreme Election Council (YSK) on Sunday evening.
According to unofficial results, with 99.43% of ballots counted, Erdoğan won the runoff vote with 52.14%, while opposition challenger Kemal Kılıçdaroğlu got 47.86%, YSK head Ahmet Yener told reporters in the capital Ankara.
