The club said "First-team coach Alex Clapham has left Meadow Lane to take up a post with another club.
"Alex joined us at the beginning of the 2021-22 season and departs with our best wishes."
Clapham took to social media to say on twitter "It’s time for me to move on from my role at Notts County.
"It’s been an honour to represent the oldest professional football club in the world.
“Huge thanks to the fans who supported us in record-breaking numbers! Good luck to all there. I’ll be supporting from afar."