| Season: | 1939–40 |
| League Result: | 3rd |
| Cup1 Result: | 2nd |
| League Topscorer: | Cemil Gürgen Erlertürk (30) |
| Season Topscorer: | Cemil Gürgen Erlertürk (33) |
| Pattern B1: | _gal1940-1943 |
| Pattern So1: | _blackyellowhorizontalstripe |
| Leftarm1: | FFD900 |
| Body1: | FFD900 |
| Rightarm1: | DC143C |
| Shorts1: | DC143C |
| Socks1: | 000000 |
| Pattern La2: | _Galatasarary1930sawayleftarms |
| Pattern B2: | _Galatasaray1930saway |
| Pattern Ra2: | _Galatasarary1930sawayrightarms |
| Pattern So2: | _gal1112a |
| Shorts2: | DC143C |
| Socks2: | 000000 |
The 1939–40 season was Galatasaray SK's 36th in existence and the club's 28th consecutive season in the Istanbul Football League.
| No. | Pos. | Name | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Apps | Goals | Apps | Goals | Apps | Goals | ||||
| align="left" | - | GK |  Avni Kurgan | 0 | 0 | 0 | 0 | 0 | 0 |
| align="left" | - | GK | Osman İncili | 17 | 0 | 14 | 0 | 31 | 0 |
| align="left" | - | DF | Adnan İncirmen | 15 | 0 | 10 | 0 | 25 | 0 |
| align="left" | - | DF | Salim Şatıroğlu (C) | 14 | 6 | 12 | 3 | 26 | 9 |
| align="left" | - | DF | Lütfü Aksoy | 0 | 0 | 1 | 0 | 1 | 0 |
| align="left" | - | DF | Faruk Barlas | 16 | 0 | 14 | 0 | 30 | 0 |
| align="left" | - | MF | Musa Sezer | 10 | 0 | 12 | 0 | 22 | 0 |
| align="left" | - | MF | Enver Arslanalp | 17 | 1 | 14 | 0 | 31 | 1 |
| align="left" | - | MF | Celal Kibarer | 16 | 0 | 6 | 0 | 22 | 0 |
| align="left" | - | FW | Nino Sarrafyan | 1 | 1 | 0 | 0 | 1 | 1 |
| align="left" | - | FW | Bülent Ediz | 3 | 1 | 5 | 1 | 8 | 2 |
| align="left" | - | FW | Bedii Etingü | 3 | 0 | 2 | 0 | 5 | 0 |
| align="left" | - | FW | Süleyman Tekil | 1 | 0 | 8 | 8 | 9 | 8 |
| align="left" | - | FW | Boduri | 15 | 8 | 7 | 1 | 22 | 9 |
| align="left" | - | FW | Sarafim Madenli | 16 | 7 | 7 | 2 | 23 | 9 |
| align="left" | - | FW | Eşfak Aykaç | 11 | 6 | 11 | 3 | 22 | 9 |
| align="left" | - | FW | Selahattin Almay | 15 | 14 | 13 | 6 | 28 | 20 |
| align="left" | - | FW | Gündüz Kılıç | 1 | 0 | 13 | 16 | 14 | 16 |
| align="left" | - | FW | Sabri Gençay | 0 | 0 | 0 | 0 | 0 | 0 |
| align="left" | - | FW | Cemil Gürgen Erlertürk | 16 | 30 | 5 | 3 | 21 | 33 |
See main article: 1939–40 Istanbul Football League.
Kick-off listed in local time (EEST)
See main article: 1940 Turkish National Division.