George Clooney Wedding -- Church Pleads With Paps ... He's Not Getting Married Here!

George Clooney's potential wedding has paparazzi swarming around a London church, but church leaders swear on their boss ... it ain't going down there.

The Chelsea Old Town Hall finally had to address the buzz about a possible London ceremony -- posting a note on it's door, writing ... "We are not conducting the wedding of Mr. Clooney at this office today (Friday 12 September) and a film crew and press photographers would only cause possible disruption to other couples getting married on this day."

Clooney has said he plans to marry his fiancee, Amal Alamuddin in Italy, but rumors persist they will also do it in London ... where she lives.