The former Hibernian boss had been in charge since the departure of Brendan Rodgers to Leicester City in February and guided the team to their eighth title in a row before completing the treble Treble with victory over Hearts in the Scottish Cup final. John Kennedy will be assistant manager and Damien Duff continues his role as first-team coach.
Celtic chief executive Peter Lawwell told the club website: “We have known Neil as a player, captain, coach and manager. He has brought great success to Celtic in the past and we’re sure he’ll do so again in the future.”
Lennon said: “It is a massive honour to be named Celtic manager once again. I had always dreamed of returning to this role on a permanent basis and I am absolutely delighted to once again be part of one of the biggest and best clubs in the world."