Fletcher has taken 36 wickets at 13.22, with Peter Moores' side currently second in Group One with a game in hand.
"To have cemented another three years to be here at Trent Bridge is amazing for me and my family. I have never really pictured myself playing anywhere else," said Fletcher, who has had loan spells at Surreyand Derbyshirein 2015 and 2016.
“Due to injury and the pandemic, I had a year off four-day cricket last season, and I think my body enjoyed that. Mentally, too, I came back really excited to get involved and I felt like I had a point to prove.
“I’ve worked on a few things in the winter with Kevin Shine which has had an impact, and this year has been the best start to a season I have ever had, so hopefully it can continue."
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