| Mariana Costa | |
| Birth Date: | 14 October 1992 |
| Birth Place: | São Paulo, Brazil |
| Height: | 1.66 m |
| Position: | Right wing |
| Currentclub: | Debreceni VSC |
| Clubnumber: | 88 |
| Years1: | –2013 |
| Clubs1: | CPH Handebol |
| Years2: | 2013–2014 |
| Clubs2: | Vendsyssel Håndbold |
| Years3: | 2014–2015 |
| Clubs3: | Hypo Niederösterreich |
| Years4: | 2015–2017 |
| Clubs4: | Nykøbing FH |
| Years5: | 2017–2018 |
| Clubs5: | CS Măgura Cisnădie |
| Years6: | 2018–2019 |
| Clubs6: | SCM Craiova |
| Years7: | 2019–2021 |
| Clubs7: | Gloria Bistrița |
| Years8: | 2021–2023 |
| Clubs8: | Debreceni VSC |
| Nationalteam1: | Brazil |
| Nationalcaps1: | 63 |
| Nationalgoals1: | 177 |
Mariana Costa (born 14 October 1992) is a Brazilian handballer for the Brazilian national team.[1] [2]