Pietersen was axed by the England and Wales Cricket Board (ECB) in February last year, but incoming ECB chairman Colin Graves has suggested a return to county cricket would enhance his chances of an England recall.
He agreed a release from the majority of his contract with Indian Premier League side the Sunrisers Hyderabad on Tuesday and will therefore be available to play for Surrey from the start of the county season in April.
"I'm absolutely thrilled to be back at Surrey," Pietersen, who was de-registered by Surrey at the end of last season, told the club website.
"There is a fantastic group of lads here, and I hope we can deliver what the great Surrey fans want to see -- lots of runs and comprehensive victories."
Stewart added: "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."
Surrey begin the 2015 County Championship season with a match against Glamorgan in Cardiff that starts on April 19.
The South Africa-born batsman is England's all-time leading run-scorer in all formats and he reiterated his desire to end his international exile in a statement on his personal website on Tuesday.
"I've never made any secret of my overwhelming desire to once again represent England and I'm going to do everything in my power to earn a recall to the international set-up," he said.
"To once again put on that England shirt would be a privilege and an honour, but now I have to focus on performing domestically and give myself the best possible chance of meriting selection."
National selector James Whitaker said last week that Pietersen was "not part of our plans", while captain Alastair Cook described the chances of his former team-mate making a comeback as "very unlikely".
Pietersen was dropped after England's 2013-14 Ashes series whitewash in Australia, with ECB managing director Paul Downton citing his "disengagement" with his team-mates during the last Test in Sydney.
He subsequently released an autobiography in which he alleged that a bullying culture had taken root in the England changing room.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
