The 2016–17 Mohun Bagan A.C. season is the club's 127th season since their formation in 1889 and their 20th season in the I-League which is India's top football league. They finished 3rd in the table in the Calcutta Football League. They are currently placed 3rd in the I-League and are playing in the group stage of the AFC Cup.

On 14 June 2016 Mohun Bagan announced that they would be fielding a junior side in the Calcutta Football League which would be mentored by assistant coach Sankarlal Chakraborty. The club officials also announced that they would not be fielding a side in the exhibition matches of the Calcutta Football League against East Bengal and Mohammedan due to disagreement with the IFA over television broadcast rights sharing and match-day ticket distribution.

Mohun Bagan confirmed the signing of former Salgaocar striker Darryl Duffy on 30 June 2016, striking a 1-year deal with the Scottish forward.

Mohun Bagan started their training for the season on 6 July 2016 under the guidance of assistant coach Sankarlal Chakraborty.

On 18 July 2016, Bagan's new striker, Darryl Duffy arrived in Kolkata and joined practice the following day. Mohun Bagan played their first practice match of the season against Peerless on 19 July 2016, where they went down 2–0 against their opponents.

On 22 July 2016, the Mariners played their second practice match of the season against a weak CFC and demolished their opponents 8–0. Star striker Darryl Duffy scored a brace and also found the back of the net for the first time in Green and Maroon colours, while other scorers included the lights of Kean Lewis, Tapan Maity (brace), Pankaj Moula, Babul Biswas, Ajay Singh.

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