Batsman and fast bowler agree new deals.
Two key players from Yorkshire's 2014 County Championship winning side have signed new contracts.
Seamer Steve Patterson has agreed a deal until December 2016 and England Lions opener Alex Lees has committed his future until December 2019.
Patterson said: “I’m delighted to commit my immediate future to the club.
“We have a tight unit and we know after winning the Championship last year we are going to have to improve our game further to retain the title. That challenge excites us all and we will be doing all we can to continue our efforts amongst the elite of English cricket.”
Lees, who scored 971 Championship runs at an average of just over 44 in 2015, added: "It has been an incredible year for me and signing a new contract tops it off nicely.
“It is a great honour to play for Yorkshire. To have that privilege over the next few years is very satisfying.
"I have a personal goal of continuing to test myself against all bowling attacks, scoring big runs and doing my bit to help the Club prosper."