Lötzsch has been criticized for suggesting that former employees of the Stasi, the secret police of the former East German state, should be allowed to serve in parliaments and governments. The leader of the Alliance '90/The Greens, Claudia Roth, claimed that Gesine Lötzsch wants to "sweep the past under the carpet". Lötzsch's local party group in Berlin-Lichtenberg has invited former Stasi employees and informers to speak on several occasions with her support: for instance, Erich Mielke's immediate deputy, Werner Grossmann, was invited as a speaker. Green member of parliament Wolfgang Wieland criticized her for appearing as a speaker before a revisionist association, the Initiativgemeinschaft zum Schutz der sozialen Rechte.
Gesine Lötzsch is married to Ronald Lötzsch, who in 2010 was revealed to have been an informer for the Stasi.