The deal ties the 20-year-old to the club until at least the end of 2017.
Kelly, who has played 10 games with the Crows since being selected with pick No. 40 in the 2013 Rookie Draft, said he was delighted to re-sign.
“I’m rapt to be at the Club for another two years,” Kelly said.
“It’s a fantastic Club. We’re going in the right direction, I know that for sure.”
Read more at AFC.com.au