He initially joined Surrey on loan in the 2020 season before his three-year contract began.
Overton brings with him nine years of experience at county level. Since his Somerset debut in 2012, he has been a key pillar of one of the best attacks in county cricket.
The Devon-born six-foot-five right-arm fast bowler is also a dynamic fielder and dangerous lower order batsman, scoring at a quick rate in red and white ball cricket.
His first appearances in a Surrey shirt helped us to the 2020 Vitality Blast final and now he will be looking to kick on with both bat and ball.