| Club: | Kasımpaşa |
| Season: | 2020–21 |
| Ownertitle: | Owner |
| Owner: | Turgay Ciner |
| Chrtitle: | Chairman |
| Chairman: | Hasan Hilmi Öksüz |
| Mgrtitle: | Manager |
| Manager: | Mehmet Altıparmak (until 2 November 2020) İrfan Buz (from 13 November 2020 to 27 November 2020) Fuat Çapa (from 28 November 2020) |
| Stadium: | Recep Tayyip Erdoğan Stadium |
| League: | Süper Lig |
| League Result: | 15th |
| Cup1: | Turkish Cup |
| Cup1 Result: | Round of 16 |
| League Topscorer: | Yusuf Erdoğan (7) |
| Season Topscorer: | Yusuf Erdoğan Armin Hodžić (7 each) |
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| Updated: | 8 March 2021 |
| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
The 2020–21 season is Kasımpaşa S.K.'s 100th season in existence and the club's sixth consecutive season in the top flight of Turkish football. In addition to the domestic league, Kasımpaşa will participate in this season's editions of the Turkish Cup. The season covers the period from July 2020 to 30 June 2021.
| scope=col | Player | Transferred from | scope=col; style="width: 65px;" | Fee | scope=col | Date | scope=col | Source | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 19 | DF |  Julian Jeanvier | Brentford | Loan | [2] | |||||
| 92 | FW |  Isaac Kiese Thelin |  Anderlecht | Loan | [3] | |||||
| 32 | DF | Derrick Luckassen | PSV | Loan | [4] | |||||
| 4 | MF | Danny Drinkwater | Chelsea | Loan | [5] | |||||
| 26 | MF | Kristijan Bistrović |  CSKA Moscow | Loan | [6] |
| scope=col | Player | Transferred to | scope=col; style="width: 65px;" | Fee | scope=col | Date | scope=col | Source | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 17 | Released | Free | [7] |
See main article: 2020–21 Süper Lig.
See main article: 2020–21 Turkish Cup.
| width=15 | width=15 | width=15 | width=15 | width=145 | Name | width=80 | Süper Lig | width=80 | Turkish Cup | width=80 | Total | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 11 | MF |  | Yusuf Erdoğan | 7 | 0 | 7 | ||||||||
| 30 | FW |  | Armin Hodžić | 5 | 2 | 7 | |||||||||
| 3 | 92 | FW | | Isaac Kiese Thelin | 6 | 0 | 6 | ||||||||
| 4 | 9 | FW | Bengali-Fodé Koita | 3 | 0 | 3 | |||||||||
| 20 | MF |  | Alan | 1 | 2 | 3 | |||||||||
| 35 | MF | | Aytaç Kara | 3 | 0 | 3 | |||||||||
| 7 | 21 | MF |  | Kevin Varga | 2 | 0 | 2 | ||||||||
| 24 | MF | | Mickaël Tirpan | 1 | 1 | 2 | |||||||||
| 9 | 7 | MF | | Anıl Koç | 0 | 1 | 1 | ||||||||
| 10 | MF | | Haris Hajradinović | 1 | 0 | 1 | |||||||||
| 41 | MF | | Berat Kalkan | 0 | 1 | 1 | |||||||||
| 55 | MF | | Yasin Dülger | 0 | 1 | 1 | |||||||||
| Own goals | 2 | 0 | 2 | ||||||||||||
| Totals | 31 | 8 | 39 | ||||||||||||
Last updated: 8 March 2021[8]