Depends on whether you look at total GDP or per capita GDP
Top 10 Richest Countries in Europe by total 2020 GDP (current US$ - World Bank)
Germany - $3.8 trillion
United Kingdom - $2.7 trillion
France - $2.6 trillion
Italy - $1.9 trillion
Russia* - $1.5 trillion
Spain - $1.3 trillion
Netherlands - $913.8 billion
Switzerland - $752.2 billion
Turkey - $720.1 billion
Poland - $594.2 billion
Top 10 Richest Countries in Europe by 2020 GDP per capita (current US$ - World Bank)
Monaco - $190,513
Liechtenstein - $180,367
Luxembourg - $115,874
Switzerland - $87,097
Ireland - $85,268
Norway - $67,390
Denmark - $61,063
Iceland - $59,270
Netherlands - $52,397
Sweden - $52,259
Top 10 Richest Countries in Europe by 2020 GNI per capita (Atlas Method, current US$ - World Bank)
Liechtenstein - $117,740
Switzerland - $84,310
Norway - $78,180
Luxembourg - $73,500
Ireland - $64,150
Denmark - $63,070
Iceland - $62,420
Sweden - $54,060
Netherlands - $51,060
Finland - $49,700