The protesters cut themselves free around 10pm after City of London Police entered the cathedral, an occupy spokesman said.
He said they decided to cut themselves free after being warned by officers that they faced arrest.
They have now left the cathedral.
Some of the awareness-raising they wanted to do has been done.
The Dean has also agreed to meet them and talk.
More top news
Ed Miliband formally launched Labour's election campaign hours after he and David Cameron submitted themselves to the first TV event.
Investigators believe Andreas Lubitz deliberately killed himself and 149 others. They are now attempting to ascertain why.
Settled for some, showery for others.