Niels Annen (born 6 April 1973) is a German politician and member of the SPD.
After his first term in the Bundestag from 2005 to 2009, Annen was a Senior Transatlantic Resident at the German Marshall Fund in Washington between 2010 and 2011.
From 2011 until 2013 he worked for the department for International Policy Analysis of the Friedrich Ebert Foundation in Berlin.
Annen has served on the executive board of the SPD since 2003 after being chairman of the Young Socialists, the youth organization of the SPD, from 2001 to 2004.