| Alexander Berntsson | |
| Fullname: | Erik Alexander Berntsson |
| Birth Date: | 30 March 1996 |
| Birth Place: | Halmstad, Sweden |
| Position: | Defender |
| Currentclub: | KÍ Klaksvík |
| Clubnumber: | 3 |
| Youthyears1: | –2014 |
| Youthclubs1: | Halmstads BK |
| Years1: | 2014–2022 |
| Clubs1: | Halmstads BK |
| Caps1: | 172 |
| Goals1: | 5 |
| Years2: | 2023 |
| Clubs2: | Jönköpings Södra IF |
| Caps2: | 27 |
| Goals2: | 2 |
| Years3: | 2024– |
| Clubs3: | KÍ Klaksvík |
| Caps3: | 3 |
| Goals3: | 0 |
| Nationalyears1: | 2014–2015 |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 0 |
| Pcupdate: | 15 July 2024 |
Alexander Berntsson (born 30 March 1996) is a Swedish footballer who plays for KÍ Klaksvík as a defender.