Brooklyn Republican Party chairman Craig Eaton is backing super market mogul John Catsimatidis for mayor.

“John Catsimatidis will be a superior candidate for our Republican Party and for all the New Yorkers who care about the future of our city,” Eaton said.

“John has not forgotten his roots as a small businessman. He’s a job creator.”

Catsimatidis has also been endorsed by the Queens and Manhattan GOP.

His chief rival, front-runner Joe Lhota, has the backing of influential Brooklyn Sen. Marty Golden and most GOP elected officials.