| Björn Harmsen | |
| Position: | Head coach |
| League: | Basketball Bundesliga |
| Team: | Science City Jena |
| Birth Date: | 19 July 1982 |
| Birth Place: | Göttingen, Germany |
| Nationality: | German |
| Coach Start: | 2005 |
| Cyears1: | 2005–2006 |
| Cteam1: | POM Baskets Jena (assistant) |
| Cyears2: | 2006–2008 |
| Cteam2: | Science City Jena |
| Cyears3: | 2008–2011 |
| Cteam3: | Mitteldeutscher |
| Cyears4: | 2011–2012 |
| Cteam4: | Gießen 46ers |
| Cyears5: | 2012–present |
| Cteam5: | Science City Jena |
| Highlights: |
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Björn Harmsen (born 19 July 1982) is a German basketball coach. He is the current head coach of Science City Jena. He started his coaching career in 2005, with Jena.
In 2016, Harmsen achieved promotion to the first-tier Basketball Bundesliga with Science City Jena.[1]