Daniels, whose real name is Newton Edward Daniels, has had a career spanning nearly four decades. The magician first found fame in the 1980s with his TV series The Paul Daniels Magic Show. He went on to become one of the biggest stars of British TV.
He married Debbie McGee, a fellow performer and his on-stage assistant in 1988.
A statement from his publicist said: “We can confirm that one of our greatest magicians and entertainers of all times, Paul Daniels, has sadly been diagnosed with an incurable brain tumour.
“On behalf of Paul, Debbie and their families, we thank you for your kind concerns and support at this sad time and ask that their privacy continues to be respected. There will be no further comments at this time.”