The cider brand will replace Tennent's Lager as the club's main sponsor when that deal expires at the end of the season.
Celtic chief executive Peter Lawwell said: "On behalf of everyone at Celtic, I am delighted to welcome Magners as the club's new shirt sponsor. This partnership is magnificent news, not only for Celtic but also for Scottish football. We are proud to be successfully leading Scottish football at home and in Europe."
- Sports & Recreation