Around 70% of Muslim prison chaplains teach a hardline fundamentalist interpretation of Islam which challenges British values and encourages radical thinking.
The findings are expected to be revealed in a new study by former Home Office official Ian Acheson, which is scheduled to be published next month.
Muslim prisoners represent just 10.8% of the total prison population in the UK, with 12,622 people in jail identifying as a Muslim, according to the Ministry of Justice.