The Harry Potter author was reacting to the Finsbury Park mosque attack, which saw worshippers observing Ramadan attacked by a man driving a van.
The suspect, Darren Osborne, is then said to have been heard shouting that he wanted to “kill all Muslims”.
— J.K. Rowling (@jk_rowling) June 19, 2017
She posted a picture of the former Ukip leader standing alongside a controversial “breaking point” poster that was meant to highlight the immigration issues during last year’s EU referendum.
The author wrote alongside to her 10.7 million followers: “Let’s talk about how the #FinsburyPark terrorist was radicalised.”
Mr Farage took to his LBC radio show to call out Ms Rowling’s tweet, calling her out for her “prejudice and ignorance”.
He said: “After all the other terrorist attacks that have happened in our country, she [JK Rowling] has said that our country will stand up and we will get through this and she obviously criticised Donald Trump.
“But nowhere did she seem to blame anybody for the radicalisation that happened.
“She didn’t blame the prison service for the London Bridge attacker being radicalised.
“She didn’t blame any extreme clerics or any appalling videos on the Internet – yet today she knows who is guilty.”
He went on: “JK Rowling says ‘let’s talk about how the Finsbury Park terrorist was radicalised and does that by putting a picture of me and the ‘breaking point’ picture of the huge queues of people trying to get into Europe last year as part of the Merkel madness.
“I have to say to JK Rowling that you may really dislike me, you may hold a prejudice against me but if you listened to this show you would know that I’ve been one of the voices all through the past 10 or 11 weeks saying the last thing we want is a war against Islam. It would be a catastrophe.
“I’m sorry but you’re speaking here out of pure prejudice and ignorance.”
Mr Farage then offered Ms Rowling the chance to speak to him on air to discuss the subject.
One person was killed in the Finsbury Park attack, while another 10 were left injured.
Osborne, 47, from Cardiff, has been held on suspicion of attempted murder and alleged terror offences.
Top pic: LBC