Officials say the former Beatle and fiancee Nancy Shevell have posted a notice of intention to marry at London's Marylebone Register Office.
Westminster Council said the notice was posted Wednesday, meaning the couple could marry anytime after September 30.
Alison Cathcart, Westminster City Council's superintendent registrar, said Friday she would be officiating and was "delighted that Paul and Nancy have chosen Marylebone Town Hall for their special day."
McCartney married his first wife Linda at the venue in 1969. She died of cancer in 1998, and he later married Heather Mills. They divorced in 2008.
McCartney's spokesman had no immediate comment.
