The study also reveals that Premier League giants Manchester United and Chelsea are the two most widely supported English teams in Europe as they came third and fourth, ahead of Bayern Munich of Germany.
Sport + Markt's study of 'Football Top 20' analysed the popularity of domestic and international football clubs in 17 European countries (Germany, France, the UK, Italy, Spain, Portugal, Turkey, Netherlands, Austria, Switzerland, Greece, Poland, Croatia, Bulgaria, Ukraine, Czech Republic and Russia).
While results are given in the millions, these are extrapolated from interviews with over 10,200 fans between the ages of 16 to 69.
Barcelona emerged as the most supported club with 57.8% while their archrivals and fellow Primera Division giants Madrid came second with 31.3%. Manchester United came a close third with 30.6%. Chelsea, Arsenal and Liverpool complete the list of English teams in the Top 20.
Serie A has four representatives as well - Milan and Inter are ranked seventh and eighth respectively while Juventus are tenth and Roma are 19th. Russian club Zenit St. Petersburg, Dynamo Kiev of Ukraine and Ajax of the Netherlands also made the list.
The table in full is below.
| Real Madrid
| Manchester United
| Bayern Munich
| AC Milan
| Zenit St. Petersburg
| CSKA Moscow
| Spartak Moscow
| Dynamo Kiev