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
A 19 year-old from South East London has pleaded guilty after he soiled himself and revealed where he had hidden packets of heroin.
An air ambulance took the woman and two young children to hospital after the incident in Somerset.
Cuts to beds, ward closures and hospital mergers are part of Government plans to cut £22bn in NHS spending, documents reveal.