| Cosmin Bîrnoi | |
| Fullname: | Cosmin Marian Bîrnoi |
| Birth Date: | 17 September 1997 |
| Birth Place: | Hunedoara, Romania |
| Height: | 1.81 m |
| Position: | Midfielder |
| Currentclub: | Unirea Dej |
| Clubnumber: | 14 |
| Youthclubs1: | Primavera Deva |
| Youthyears2: | –2016 |
| Youthclubs2: | ACS Poli Timișoara |
| Years1: | 2016–2019 |
| Caps1: | 55 |
| Goals1: | 4 |
| Years2: | 2019 |
| Clubs2: | Politehnica Iași |
| Caps2: | 6 |
| Goals2: | 0 |
| Years3: | 2020 |
| Clubs3: | Viitorul Constanța |
| Caps3: | 1 |
| Goals3: | 0 |
| Years4: | 2020–2021 |
| Clubs4: | Farul Constanța |
| Caps4: | 23 |
| Goals4: | 2 |
| Years5: | 2021–2023 |
| Clubs5: | ASU Politehnica Timișoara |
| Caps5: | 46 |
| Goals5: | 9 |
| Years6: | 2023–2024 |
| Clubs6: | Unirea Slobozia |
| Caps6: | 6 |
| Goals6: | 1 |
| Years7: | 2024– |
| Clubs7: | Unirea Dej |
| Caps7: | 10 |
| Goals7: | 2 |
| Pcupdate: | 11 May 2024 |
Cosmin Marian Bîrnoi (born 17 September 1997) is a Romanian professional footballer who plays as a midfielder for Liga II club Unirea Dej.
ACS Poli Timișoara