Harm Osmers (born 28 January 1985) is a German football referee who is based in Hanover.

He referees for SV Baden of the Lower Saxony Football Association.

On 15 July 2015, he made an international debut as an assistant for Daniel Siebert for the UEFA Champions League qualifier between Celtic and Stjarnan.

In the summer of 2016, Osmers was one of four referees promoted to officiate in the Bundesliga.

[4] Osmers has a diploma in business administration and works as an investment controller in Hanover.