| Mgrtitle: | Head coach |
| Chrtitle: | Secretary |
| Stadium: | Mohun Bagan Ground |
| League Result: | Champions |
| League2 Result: | Runners-up |
| Cup1 Result: | Runners-up |
| Cup2 Result: | Semi-finalist |
| League Topscorer: | Baba Diawara Fran Gonzalez (10 each) |
| Season Topscorer: | Fran Gonzalez (15) |
| Highest Attendance: | 63,756 |
| Pattern La1: | _mb1920h |
| Pattern B1: | _mb1920h |
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| Pattern Sh1: | _mb1920h |
| Pattern So1: | _mbhome_1415 |
| Leftarm1: | 91191B |
| Rightarm1: | 91191B |
| Socks1: | 91191B |
| Pattern La2: | _mb1920a |
| Pattern B2: | _mb1920a |
| Pattern Ra2: | _mb1920a |
| Pattern Sh2: | _mbaway_1213 |
| Pattern So2: | _mbaway_1213 |
| Socks2: | FFFFFF |
| Prevseason: | 2018–19 |
| Nextseason: | 2020–21 |
The 2019–20 Mohun Bagan FC season was the club's 13th season in I-League and 130th season since its establishment in 1889. The team finished runners-up in the Calcutta Football League and Durand Cup. They were crowned Champions in the I-League and reached the semifinals of the Sheikh Kamal Cup where they were defeated by Terengganu.
| Squad No. | Name | Nationality | Position | & Age |
|---|---|---|---|---|
| Goalkeepers | ||||
| 1 | Sankar Roy |  | GK | 1995 5, df=yes |
| 22 | Shilton Paul | | GK | 1988 6, df=yes |
| 24 | Debjit Majumder (on loan from ATK) | | GK | 1988 3, df=yes |
| Defenders | ||||
| 4 | Francisco Morante Martínez |  | DF | 1992 6, df=yes |
| 5 | Gurjinder Kumar (VC) | | DF | 1990 10, df=yes |
| 6 | Ashutosh Mehta | | DF | 1991 2, df=yes |
| 15 | Lalramchullova | | DF | 1995 1, df=yes |
| 25 | Dhanachandra Singh (C) | | DF | 1987 3, df=yes |
| 28 | Bikramjeet Singh (on loan from Mumbai City FC) | | DF | 1992 10, df=yes |
| 45 | Daneil Cyrus | DF | 1990 12, df=yes | |
| Midfielders | ||||
| 10 | Joseba Agirregomezkorta Beitia | | MF | 1990 9, df=yes |
| 11 | Alexander Romario Jesuraj (on loan from FC Goa) | | MF | 1996 7, df=yes |
| 16 | Nongdamba Naorem (on loan from Kerala Blasters) | | MF | 2000 1, df=yes |
| 18 | Lalramzauva Khiangte | | MF | 1997 1, df=yes |
| 26 | Shilton D'Silva | | MF | 1992 9, df=yes |
| 27 | SK Sahil Y | | MF | 2000 4, df=yes |
| 33 | | MF | 1993 3, df=yes | |
| 44 | Kiyan Nassiri GiriY | | MF | 2000 11, df=yes |
| 47 | Sheikh Faiaz (on loan from ATK) | | MF | 1995 3, df=yes |
| 50 | Francisco Javier González Muñoz | | MF | 1989 2, df=yes |
| Forwards | ||||
| 7 | Komron Tursunov |  | FW | 1996 4, df=yes |
| 9 | Baba Diawara |  | FW | 1988 1, df=yes |
| 20 | Suhair VP | | FW | 1992 9, df=yes |
| 49 | Subha Ghosh Y | | FW | 2000 12, df=yes |