The 23-year-old defender, an academy product at Villa Park, has made 75 appearances in all competitions for the club since making his senior debut in 2009, scoring six goals.
The Republic of Ireland international said: "From a personal point of view, I really couldn't be more delighted or more proud.
"I've been here since I was 12 years old, progressing from the younger teams through the youth team along with players such as Marc Albrighton, Barry Bannan and another couple who have just signed new deals in Nathan Baker and Andreas Weimann.
"It's great that we've all managed to come through together and there's a bond there with this club that's as close as family to us lads especially."
Manager Paul Lambert has been busy in the transfer market so far this summer, recruiting defenders Jores Okore and Antonio Luna, midfielders Leandro Bacuna and Aleksander Tonev, striker Nicklas Helenius and goalkeeper Jed Steer, and Clark is feeling positive about the coming season.
"Everyone's at the stage now where we just want to get out and play and the competition for places is tougher than it's been these past few seasons, no doubt about that," Clark added on avfc.co.uk.
"The players who have come in have integrated into the squad really well. There's definitely a vibrant feeling within the camp and a real desire to push on and keep building. We feel like we have very strong foundations in place.
"The manager has also been superb in instilling confidence and ambition, a real desire to succeed for the club and we're all hungry to achieve something here."
- Sports & Recreation
- Andreas Weimann
- Nathan Baker
- Brad Guzan