Yesterday we recapped the top 10 most expensive players of the 2013 summer window - and we're back today to bring the top 10 biggest spending clubs.
From Real Madrid to Shakhtar Donetsk, we've got all the top spenders in Europe covered - including three Premier League clubs.
There's a couple from Eastern Europe and even further afield - but no Anzhi this year. In fact, the formerly big-spending Russian club were among the biggest sellers this window as they looked to slash their wage bill.
In a summer that saw Cristiano Ronaldo's transfer record shattered, there was bound to be a few clubs above the £100m mark - four this summer, in fact.
Expenditure figures for the 2013 summer transfer window taken from transfermarkt.co.uk
Click through the slideshow to see Europe's biggest summer spenders - and the players they spent their cash on.
Who do you think did the best business out of these ten clubs? Have your say below...