After 40 years in the dug-out, the former Dagenham manager has decided it’s time to move upstairs.
He will remain as the Bees’ Head of Football “allowing him to continue his progressive work in this area”.
Barnet have confirmed Darren Currie will continue in his role as take temporary charge of all first team affairs.
He will take the team this weekend as Still sits out an emotional return to the Daggers.
Legend Still said: “I have managed in over 2,000 matches and had a fantastic time in the game to date.
"I look forward to embracing my new role and supporting my young protégé Darren Currie in his growth as a coach."
Barnet chairman Tony Kleanthous said: “Recovering from relegation from the EFL was always going to be difficult and we needed an experienced head to guide us through the turbulent summer.
"John’s record in the National League is second to none and having steadied the ship, we are now in good shape to push forward in 2019.
"I look forward to continuing our working relationship as he develops the technical structure of the club.”