The defender, who arrived in the Premier League from Dutch side NEC Nijmegen in 2008, has extended his stay at the Hawthorns until 2016 with his contract set to expire next summer
The Sweden international's deal was set to expire next summer but the new terms will see him stay at the Hawthorns until 2016.
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“This is great news for the club and shows we’re heading in the right direction," Clarke told West Brom's official website.
“We’ve had a productive summer in terms of bringing new players in but it’s equally important that you hold onto your best players, and Jonas certainly fits into that category.
“He’s a tough, uncompromising central defender who knows all about the Premier League and the opponents he’s up against week in, week out. Jonas is also a very important character and leader in our dressing room.”