2020–21 ATK Mohun Bagan FC season

The 2020–21 ATK Mohun Bagan FC season was the club's 1st season in Indian Super League and 131st season since its establishment in 1889. The club under a merged company competed in ISL, one of the top flights of Indian football, as well as in the AFC Cup (because of delays, the AFC Cup campaign has been moved to 2021–22 season).

Players
{|class="wikitable" style="text-align:center; font-size:90%; width:80%;" !style="background:#1A5026; color:white; text-align:center;"|Squad No. !style="background:#1A5026; color:white; text-align:center;"|Name !style="background:#1A5026; color:white; text-align:center;"|Nationality !style="background:#1A5026; color:white; text-align:center;"|Position !style="background:#1A5026; color: white; text-align: center;"|Date of Birth & Age !colspan=6 style="background:#7a1024; color:white; text-align:center;"|Goalkeepers !colspan=6 style="background:#7a1024; color:white; text-align:center;"|Defenders !colspan=6 style="background:#7a1024; color:white; text-align:center;"|Midfielders !colspan=6 style="background:#7a1024; color:white; text-align:center;"|Forwards
 * 12
 * Avilash Paul
 * 🇮🇳
 * GK
 * December 26, 1994
 * 29
 * Arindam Bhattacharya (Captain)
 * 🇮🇳
 * GK
 * December 11, 1989
 * GK
 * December 11, 1989
 * 2
 * Sumit Rathi
 * 🇮🇳
 * DF
 * August 26, 2001
 * 5
 * Sandesh Jhingan (Captain)
 * 🇮🇳
 * DF
 * July 21, 1993
 * 15
 * Subhasish Bose
 * 🇮🇳
 * DF
 * August 18, 1995
 * 20
 * Pritam Kotal (Captain)
 * 🇮🇳
 * DF
 * September 8, 1993
 * 27
 * Boris Singh Thangjam
 * 🇮🇳
 * DF
 * January 3, 2000
 * 44
 * Tiri
 * 🇪🇸
 * DF
 * July 14, 1991
 * 44
 * Tiri
 * 🇪🇸
 * DF
 * July 14, 1991
 * July 14, 1991
 * 8
 * Carl McHugh
 * 🇮🇪
 * MF
 * February 5, 1993
 * 10
 * Edu García (Captain)
 * 🇪🇸
 * MF
 * April 24, 1990
 * 11
 * Brad Inman
 * 🇦🇺
 * MF
 * December 10, 1991
 * 14
 * Glan Martins
 * 🇮🇳
 * MF
 * July 1, 1994
 * 16
 * Jayesh Rane
 * 🇮🇳
 * MF
 * February 20, 1993
 * 17
 * Pronay Halder
 * 🇮🇳
 * MF
 * February 25, 1993
 * 18
 * Sheikh Sahil
 * 🇮🇳
 * MF
 * April 28, 2000
 * 19
 * Javi Hernández
 * 🇪🇸
 * MF
 * June 6, 1989
 * 23
 * Michael Soosairaj
 * 🇮🇳
 * MF
 * December 25, 1994
 * 25
 * Michael Regin
 * 🇮🇳
 * MF
 * May 9, 1988
 * 33
 * Prabir Das
 * 🇮🇳
 * MF
 * December 20, 1993
 * 25
 * Michael Regin
 * 🇮🇳
 * MF
 * May 9, 1988
 * 33
 * Prabir Das
 * 🇮🇳
 * MF
 * December 20, 1993
 * December 20, 1993
 * 6
 * Manvir Singh
 * 🇮🇳
 * FW
 * November 6, 1995
 * 9
 * David Williams
 * 🇦🇺
 * FW
 * February 26, 1988
 * 21
 * Roy Krishna (Captain)
 * FW
 * August 30, 1987
 * Roy Krishna (Captain)
 * FW
 * August 30, 1987
 * August 30, 1987

Management team
{| class="wikitable" !style="background:#1a5026; color:white; text-align:center"|Position !style="background:#7a1024; color:white; text-align:center"|Name
 * Head coach
 * 🇪🇸 Antonio López Habas
 * Assistant coach
 * 🇪🇸 Manuel Cascallana
 * Goalkeeping coach
 * 🇪🇸 Ángel Pindado
 * Head of Youth Development/Assistant Manager
 * 🇮🇳 Sanjoy Sen
 * Goalkeeping coach
 * 🇪🇸 Ángel Pindado
 * Head of Youth Development/Assistant Manager
 * 🇮🇳 Sanjoy Sen
 * Head of Youth Development/Assistant Manager
 * 🇮🇳 Sanjoy Sen
 * Head of Youth Development/Assistant Manager
 * 🇮🇳 Sanjoy Sen