| Marian Kosiński | |
| Birth Date: | 4 December 1945 |
| Birth Place: | Tarnowskie Góry, Poland |
| Death Date: | 21 April 2021 (aged 75) |
| Height: | 186cm |
| Position: | Central defender |
| Youthclubs1: | Gwarek Tarnowskie Góry |
| Years1: | –1969 |
| Clubs1: | Gwarek Tarnowskie Góry |
| Years2: | 1969–1980 |
| Clubs2: | Stal Mielec |
| Caps2: | 263 |
| Goals2: | 2 |
| Manageryears1: | 1980–81 |
| Managerclubs1: | Stal Mielec (assistant manager) |
| Manageryears2: | 1982–83 |
| Managerclubs2: | Stal Mielec |
| Manageryears3: | 1989–90 |
| Managerclubs3: | Stal Mielec |
| Manageryears4: | 1989–90 |
| Managerclubs4: | Karpaty Krosno |
| Manageryears5: | 1991–92 |
| Managerclubs5: | Karpaty Krosno |
Marian Kosiński (4 December 1945 – 21 April 2021)[1] was a Polish professional football player (central defender) and coach.[2]
Before he went on to coach them, he won the title with Stal Mielec twice, and was listed in the Stal's all-time best XI.[3]