Netflix has not confirmed whether the fourth season of Sex Education is in the works. Netflix typically announced a new installment in the series just after the premiere of each season.
Asa Butterfield from Sex Education has opened up during the interview with the Cosmopolitan about whether he’d be up for doing a Netflix Sex Education fourth season,
“I’d love to do a fourth season because we have so much fun on this show. At the same time, we’ve been doing it for three years now, and I’d be happy saying goodbye to these characters… We’ll have to see.” Asa Butterfield on whether there will be a season 4

Asa also talked on whether he’d be open to a Sex Education spin-off, adding, “A spin-off would be good but it has to be well-thought-out and really unique and not just for the sake of doing a spin-off.
source: cosmopolitan
Sex Education season 3 premieres today on Netflix on 17th September 2021.
Sex Education Season 4 Release Date
If there is Sex Education Season 4 it should premiere around the same date as the third season, September 2022.
Sex Education Season 4 Cast
Sex Education Season 4 Cast should be pretty much the same with some new characters additions.
Asa Butterfield as Otis Milburn, Gillian Anderson as Jean Milburn, Ncuti Gatwa as Eric Effiong, Emma Mackey as Maeve Wiley, Connor Swindells as Adam Groff, and more.
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