Canon Andrew White has told Premier Christians have been forced to leave the second-biggest city after it was taken over by Islamist militants.
They're among around half a million people who fled Mosul when Fighters from ISIS (the Islamic State of Iraq and Syria Group) drove out local security forces.
Earlier this year, the same group took over another Iraqi city, Fallujah, and the army have been unable to take it back despite months of fighting.
It's also being reported insurgents have overrun parts of another city - Tikrit's.
It's the home of the country's former leader Saddam Hussein.
US State Department spokeswoman Jen Psaki described the situation as "extremely serious".
It's thought around one thousand Christians have been forced to flee Mosul in search of safety.
Many people have abandoned their homes with nothing and are taking shelter in monasteries and schools in other parts of the country.
Canon Andrew White spoke to Premier's Antony Bushfield.
He appealed for prayers: