Christian Carstensen (born 11 March 1973 in Hamburg) is a German politician and member of the Social Democratic Party (SPD). He was a member of the Hamburg-Nord district parliament (Bezirksversammlung) from 2001 to 2005. In 2005 he was elected to the Bundestag, the German federal parliament, representing Hamburg-Nord, however he lost his seat at the 2009 election.