Hannjo Hasse was an East German actor. Over his nearly four decade career, he was best known for his roles in the films of Lebende Ware (1966) and Walter Defends Sarajevo (1972), as well as the television series Rote Bergsteiger (1968) and Archiv des Todes (1980).

Walter Defends Sarajevo is a 1972 Yugoslav partisan film, directed by Hajrudin Krvavac and starring Bata Živojinović, Ljubiša Samardžić and Rade Marković. The film centres around a mysterious figure named 'Walter', who is actively disrupting the attempts of German commander Alexander Löhr to retreat from the Balkans. The film's eponymous character, Walter, is loosely based around Vladimir Perić, whose nom de guerre was 'Valter'.