The Netherlands quick, who moved to Canterbury in 2019, has penned a three-year extension with the club
Kent have secured the services of Fred Klaassen until at least the end of the 2024 season.
The Netherlands international has signed a three-year deal to remain at Canterbury.
Klaassen has taken 63 wickets in 53 matches across the formats for Kent.
Nineteen of those came in the Spitfires' run to last season's T20 Blast title.
"I’m really pleased to remain a Kent player for the foreseeable future and there’s a real sense of positivity around the place here," said the 29-year-old.
"This squad can push on and become a real force across all formats and I’m determined to help make more history for this club."
Director of Cricket Paul Downton added: "Fred has really grown as a cricketer since he joined us for the 2019 season.
"He has established himself as a force to be reckoned with in T20 cricket and played a significant role in Kent winning the Vitality Blast this season.
"He is ambitious, works hard and wants to play in all formats. As he continues to develop his game, he has the ability to be a major contributor to Kent cricket in the years to come."