North has virtually been rewarded for his consistency and he will be the third member of the leadership group along with Australian internationals Justin Langer and Mike Hussey.
With both Langer and Hussey expected to be involved in Australia's international assignments, North is likely to lead the side in a few games next season.
"It's a great honour to be given the responsibility of helping to lead your team-mates," North said.
"We've built an exciting group of players and I'm looking forward to assisting Justin and Michael in taking them to a Pura Cup title."
North who will be entering his seventh season with the Western Warriors was one of the key members of the middle order last season and finished as the eighth-highest scorer in the Pura Cup and fourth highest in the ING Cup.