| Sebastian Seifert | |
| Fullname: | Sebastian Seifert |
| Nationality: | Swedish  |
| Birth Date: | 12 December 1978 |
| Birth Place: | Ystad, Sweden |
| Height: | 190 cm. |
| Position: | Playmaker |
| Years1: | 1997–2000 |
| Clubs1: | IFK Ystad |
| Years2: | 2000–2002 |
| Clubs2: | KIF Kolding |
| Years3: | 2002–2003 |
| Clubs3: | TuS Nettelstedt-Lübbecke |
| Years4: | 2003–2009 |
| Clubs4: | KIF Kolding |
| Years5: | 2009–2013 |
| Clubs5: | Ystads IF |
| Nationalyears1: | 1999–2008 |
| Nationalteam1: | Sweden |
| Nationalcaps1: | 105 |
| Nationalgoals1: | 174 |
| Manageryears1: | 2013–2017 |
| Managerclubs1: | Ystads IF |
| Manageryears2: | 2018 |
| Managerclubs2: | HIF Karlskrona |
| Manageryears3: | 2019–2023 |
| Managerclubs3: | IFK Ystad |
Sebastian Seifert (born 12 December 1978) is a Swedish handball coach and previous player.