Kevin Pietersen has played for Surrey before and has a good relationship with the club
Pietersen has not played competitve cricket in England since 2015 when he had a stint in the County Championship with Surrey.
The South African-born batsman is now a T20 specialist and has played for franchises all over the world in the last two years.
Pietersen had been due to play for the St Lucia Stars in the Caribbean Premier League (CPL) this summer but has pulled out due to his desire to spend more time at home in England.
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"I'll be at home all summer," Pietersen said.
"I've had an incredibly bad winter for travel so I'll be staying at home.
"I love playing in England and I love playing at the Oval.
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Kevin Pietersen appeared in Australia this summer for the Melbourne Stars
"I've always loved the dressing room there. It's exciting news."
He has avoided the T20 Blast in England in the past due to its format, which has previously seen the competition spread over most of the season.
"I have found it quite difficult because playing once a week is hard work," Pietersen said last year.
Kevin Pietersen's Quetta Gladiators reached the PSL final, although he missed the last game
"I find tournaments like the CPL, the Big Bash and IPL – which play a lot – much easier because there is much more time in the environment.
"You spend 24/7 with the players.
"In England, playing once a week, it’s much harder because playing once a week means you are training once a week."
However, this year's competition will run in a block from early July through to the finals day on September 2.
Pietersen is one of the most successful England batsmen of all time with more than 13,000 international runs.
But he was sacked from the side in 2014 after a series of dressing-room bust-ups and has since become a T20 gun-for-hire.