2017–18 Mohun Bagan FC season

The 2017–18 Mohun Bagan FC season was the club's 11th season in I-League and 128th season since its establishment in 1889. They finished 3rd in the I-League and runners-up in the Calcutta Football League. Mohun Bagan reached the semifinals of the Super Cup where they were defeated by Bengaluru.

Sanjoy Sen resigned as the coach of Mohun Bagan on 2 January 2018 following three home draws and a defeat against Chennai City placing the team in 4th position, virtually ending their title hopes. Shankarlal Chakraborthy was appointed as head coach for the remainder of the season.

Their title hopes however did stay intact till the last fixture of the season where they could have won the title had other results gone in their favour, but it was not to be and Minerva Punjab ultimately clinched the title. Although the 2017–18 season was not an ideal season for the club after a loss of form and change of coach midway through the season along with injuries to important players like Sony Norde and Yuta Kinowaki, they did manage to win both the home and away fixtures against arch rivals East Bengal.

Sponsor
As of 3 December 2017

Technical staff
{| class="wikitable" ! Position ! Name
 * Chief coach
 * 🇮🇳 Sankarlal Chakraborty
 * Assistant coach
 * Goalkeeping coach
 * 🇮🇳 Arpan Dey
 * Physical Trainer
 * 🇮🇳 Samiran Bag
 * Physiotherapist
 * 🇮🇳 Abhinandan Chatterjee
 * Club Doctor
 * 🇮🇳 Dr. Protim Roy
 * Team Manager
 * 🇮🇳 Satyajit Chatterjee
 * Physiotherapist
 * 🇮🇳 Abhinandan Chatterjee
 * Club Doctor
 * 🇮🇳 Dr. Protim Roy
 * Team Manager
 * 🇮🇳 Satyajit Chatterjee
 * Team Manager
 * 🇮🇳 Satyajit Chatterjee