| Marcel Costly | |
| Height: | 1.83 m |
| Birth Date: | 1995 11, df=yes |
| Birth Place: | Achim, Germany |
| Position: | Right midfielder, right-back |
| Currentclub: | FC Ingolstadt |
| Clubnumber: | 22 |
| Youthyears1: | –2013 |
| Youthclubs1: | FC Verden 04 |
| Years1: | 2013–2014 |
| Clubs1: | Rotenburger SV |
| Caps1: | 24 |
| Goals1: | 8 |
| Years2: | 2014–2018 |
| Clubs2: | Mainz 05 II |
| Caps2: | 80 |
| Goals2: | 5 |
| Years3: | 2018–2020 |
| Clubs3: | 1. FC Magdeburg |
| Caps3: | 63 |
| Goals3: | 5 |
| Years4: | 2020–2022 |
| Clubs4: | Waldhof Mannheim |
| Caps4: | 73 |
| Goals4: | 8 |
| Years5: | 2022– |
| Clubs5: | FC Ingolstadt |
| Caps5: | 68 |
| Goals5: | 5 |
| Club-Update: | 7 October 2024 |
Marcel Costly (born 20 November 1995) is a German professional footballer who plays as a right midfielder or right-back for FC Ingolstadt.