| Alexandru Costache | |
| Fullname: | Alexandru Silviu Costache |
| Birth Date: | 10 October 1999 |
| Birth Place: | Bucharest, Romania |
| Height: | 1.93 m |
| Position: | Goalkeeper |
| Currentclub: | Dunărea Călărași |
| Clubnumber: | 12 |
| Youthclubs1: | "Mircea Eliade" București |
| Youthyears2: | –2017 |
| Youthclubs2: | Concordia Chiajna |
| Years1: | 2018–2022 |
| Clubs1: | Concordia Chiajna |
| Caps1: | 10 |
| Goals1: | 0 |
| Years2: | 2019 |
| Clubs2: | → Pandurii Târgu Jiu (loan) |
| Caps2: | 10 |
| Goals2: | 0 |
| Years3: | 2021 |
| Clubs3: | → Unirea Constanța (loan) |
| Caps3: | 0 |
| Goals3: | 0 |
| Years4: | 2021–2022 |
| Clubs4: | → Dunărea Călărași (loan) |
| Caps4: | 16 |
| Goals4: | 0 |
| Years5: | 2022–2023 |
| Clubs5: | Minaur Baia Mare |
| Caps5: | 8 |
| Goals5: | 0 |
| Years6: | 2023– |
| Clubs6: | Dunărea Călărași |
| Caps6: | 7 |
| Goals6: | 0 |
| Nationalyears1: | 2015–2016 |
| Nationalteam1: | Romania U18 |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 0 |
| Nationalyears2: | 2016–2018 |
| Nationalteam2: | Romania U19 |
| Nationalcaps2: | 3 |
| Nationalgoals2: | 0 |
| Pcupdate: | 14:21, 11 January 2024 (UTC) |
| Ntupdate: | 27 March 2018 |
Alexandru Silviu Costache (born 10 October 1999) is a Romanian professional footballer who plays as a goalkeeper for Dunărea Călărași.[1]