- Istanbul, Turkey: 15.9 million
- Moscow, Russia: 13.1 million
- London, United Kingdom: 8.7 million
- Saint Petersburg, Russia: 5.6 million
- Berlin, Germany: 3.8 million
- Madrid, Spain: 3.3 million
- Kyiv, Ukraine: 2.9 million
- Rome, Italy: 2.7 million
- Bucharest, Romania: 2.1 million
- Paris, France: 2.1 million
- Minsk, Belarus: 1.9 million
- Vienna, Austria: 1.9 million
- Warsaw, Poland: 1.8 million
- Hamburg, Germany: 1.8 million
- Budapest, Hungary: 1.7 million
- Belgrade, Serbia: 1.6 million
- Barcelona, Spain: 1.6 million
- Munich, Germany: 1.4 million
- Kharkiv, Ukraine: 1.4 million
- Prague, Czech Republic: 1.3 million
- Milan, Italy: 1.3 million
- Kazan, Russia: 1.3 million
- Sofia, Bulgaria: 1.3 million
- Nizhny Novgorod, Russia: 1.2 million
- Samara, Russia: 1.1 million
- Ufa, Russia: 1.1 million
- Birmingham, United Kingdom: 1.1 million
- Rostov-on-Don, Russia: 1.1 million
- Krasnodar, Russia: 1.1 million
- Cologne, Germany: 1.0 million
* Population data is from between 2021 and 2023