The Muslim population in Western Europe has grown from less than 10 million in 1990 to approximately 17 million. A new report profiles some of the oldest, largest and most influential religious networks and movements affecting Islamic relations in Europe.

These Muslim population figures are from a forthcoming Pew Forum report that estimates growth rates among Muslim populations worldwide and provides population projections for 2020 and 2030. A 2009 Pew Forum report, "Mapping the Global Muslim Population" provides 2009 population estimates. For the purposes of this report, Western Europe includes the following countries: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Number of Muslims in Western Europe: