Brown has stepped into the Crows defence in the absence of the retired Michael Doughty this season, having arrived at the club in 2011 as part of a deal that also delivered Brad Crouch from Greater Western Sydney.
After making his AFL debut in round 16 last year, Brown has averaged 10 disposals a game in his six games in 2013.
Crows list manger David Noble said it was another good sign for the club that it was able to keep hold of another promising player.
“We believe Luke will develop into an excellent player for us with versatility in either defence, where he is currently playing, or even up in the midfield in the future," Noble said.
"It’s a positive sign Luke wants to be part of our group and we are really pleased he has committed now."
Harry Thring is a reporter for AFL Media. Follow him on Twitter: @AFL_Harry.
