Jacob Chemnitz (born 19 November 1984) is a Danish badminton player from the Lillerød team.

[1][2] As a junior, Chemnitz won the mixed doubles title at the 2002/2003 Danish U-19 National Championships partnering with Line Reimers who also trained at Lillerød.

[3] He also secured a bronze medal in mixed doubles at the 2003 European Junior Championships alongside Mille Pjedsted.

[4] In senior competitions, Chemnitz won international tournaments at the 2006 Cyprus, 2007 Portugal and Polish International tournaments partnered with Mikkel Delbo Larsen in the men's doubles.

[5] Teaming up with Marie Røpke in mixed doubles, he also claimed victory at the 2008 Irish International.