Björn Harmsen (born 19 July 1982) is a German basketball coach. He most recently was the head coach of Science City Jena of the German Basketball Bundesliga (BBL).

Coaching career He started his coaching career in 2005, with Jena.

In 2016, Harmsen achieved promotion to the first-tier Basketball Bundesliga with Science City Jena.

In 2021 he signed with Uni Baskets Münster of the German ProB. He led the team to a promotion to the ProA in the 2021/22 season.

After the first ProA season with Uni Baskets Münster he signed back with Science City Jena in 2023.

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