Pietersen, bidding to return to the international scene after being sacked last year, will be available for all forms of cricket, starting with Surrey's opening county championship fixture on April 19.
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"I'm absolutely thrilled to be back at Surrey. It's a club very close to my heart and Alec Stewart, Graham Ford and everyone at the club has been exceptionally supportive," Pietersen said on Surrey's website (www.kiaoval.com)
"There is a fantastic group of lads here and hopefully we can deliver what the great Surrey fans want to see -- lots of runs and comprehensive victories."
Surrey's director of cricket Stewart said the move would be mutually beneficial.
"A Kevin Pietersen with ambitions to play for England and a real determination to score big runs for Surrey will be a huge asset to us," he said.
Also read: Pietersen released from IPL deal to make county switch
Image: Kevin Pietersen
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