Hundreds of worshippers had to flee morning Mass at Saint Donatien in the city of Nantes as the flames took hold.
Revd Benoit Bertrand told local media that the blaze started during the service at around 10.30 local time.
"I see flames still escaping," he said on BFM television.
French authorities have confirmed that 40 firefighters are tackling the blaze which has spread to the roof of the church.
Smoke from the blaze can be seen across the western city.
In a world of fake news there’s never been a greater need for quality Christian journalism. Premier’s mission is to provide the Church with the most up to date and relevant news, told from a Christian perspective. But we can’t do it without you.
Unlike many websites we haven't put up a paywall — we want to keep our journalism free at the point of need and as open as we can. Premier’s news output takes a lot of time, money and hard work to produce. No one in the USA is sharing news like we are across radio, magazines and online so please help us to continue that today.
For a monthly gift of $11 or more we’d also be able to send you a free copy of the brand new Premier Bible, a wonderful Anglicised version of the NLT packed with exclusive bonus content, reading plan and resources to help you get the most out of scripture.
Your monthly support will make a world of difference. Thank you.
Support Us
