The show, which stars Tom Hollander and Olivia Colman, focuses on the struggles of an inner-city vicar.
The BBC has now asked for more episodes and a Christmas special, while Peep Show writer Sam Bain has joined the crew as script editor.
"Rev. was my favourite new show of 2010," Bain said. "It was a great achievement to carve such a funny show out of such challenging material. I'm excited to be part of the team and contribute my experience of writing about religious extremists and sexually frustrated men."
Meanwhile, the BBC's controller of comedy commissioning Cheryl Taylor said: "Rev. was one of the comedy highlights of last year and we're thrilled to be returning to St Saviour's to see more of the Rev. Smallbone and his hilarious and moving pastoral, marital and spiritual challenges."
Rev. recently won 'Best Comedy' at the South Bank Awards. The show was also praised by the Archbishop of Canterbury, who described it as a "noble enterprise".
The new episodes of Rev. are expected to air later this year.