The Tigers also have the option to extend the 29-year old’s contract until 2019.
“It feels really good to get my new deal nailed down,” said Cook.
“It’s been a tough year for the boys with all the injuries but to finish fifth was great for us.
“I’ve now got another two seasons to make sure I am around the club as I feel we’ll be challenging for silverware and it’s exciting times.”
Tigers head coach Daryl Powell believes the new deal is reward for some fine efforts in 2016.
“Matt Cook has shown at the end of the season his potential as a player is still growing,” he said.
“I expect him to be a big part of an outstanding pack over the coming seasons and I am delighted he has agreed to extend his contract.”