Once Is Never (German: Einmal ist keinmal) is a 1955 East German comedy film directed by Konrad Wolf and starring Horst Drinda, Brigitte Krause and Paul Schulz-Wernburg.^[1] It was made by the state-controlled studio DEFA.

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• Horst Drinda as Peter Weselin
• Brigitte Krause as Anna Hunzele
• Paul Schulz-Wernburg as Edeltanne
• Annemone Haase as Elvira
• Christoph Engel as Erwin
• Friedrich Gnaß as Hunzele
• Georg Niemann as Düdelit-Düdelat
• Lotte Loebinger as Muhme
• Hilmar Thate as Buhlemann
• Fritz Decho as Fibrament
• Horst Gentzen as Gack
• Edgar Engelmann as Gwriz
• Erich Brauer as Kranz
• Johanna Bucher as Frau Kranz
• Johannes Siegert as Dr. Scherb
• Inge Huber as Marie Alvert
• Johannes Arpe as Arzt
• Gertrud Paulun as Haushälterin
• Norbert Christian as Pinco
• Gustav Müller as Wadenwärmer
• Liska Merbach as Luise
• Paul Pfingst as Fahrer
• Jutta Beetz as Rothaarige Dame
• Maika Joseph as 1. Beerenfrau
• Lotte Meyer as 2. Beerenfrau
• Rolf Bartholsen as Briefträger
• de:Jutta Zoff as Akkordeonsolistin