The 2013–14 season was the 125th season of competitive football by Celtic. Celtic have a new shirt sponsor for the season with Irish Cider brand Magners taking over from Tennent's Lager for the next three years.

Celtic began the season with further Champions League success in their sights. They were faced with the burden of replacing three main pieces of their squad in; Gary Hooper and Kelvin Wilson were sold to Norwich City and Nottingham Forest respectively, whilst the highly rated Victor Wanyama was sold to Southampton for a Scottish record fee of £12.5 million. Neil Lennon rebuilt his squad by signing Virgil van Dijk and Amido Balde in the summer, and Teemu Pukki from Schalke 04 on transfer deadline day. Celtic were drawn with Cliftonville in their first qualifying round and easily disposed of the Northern Irish champions 5–0 on aggregate. They were next drawn with IF Elfsborg and squeezed by with a 1–0 aggregate win, with Kris Commons scoring the only goal in the first leg at Celtic Park. Although favoured to qualify for the group stages with minimal challenge after being drawn with Kazahk champions Shakhter Karagandy, Celtic found themselves losing the first leg in Karagandy 2–0. Celtic returned to Scotland to an electric atmosphere at Celtic Park in the home leg, in proved to be the high point of their 2013-14 Champions League campaign. They overcame the 2–0 deficit to level the aggregate thanks to goals by Kris Commons and Georgios Samaras. James Forrest completed the comeback for Celtic with a 90th-minute strike, sending Celtic Park into a frenzy.

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