This special issue considers the significance of film to the establishment and development of scientific approaches to the mind. Bonnie Evans explores how the origins of film technologies in 1895 in France encouraged a series of innovative collaborations, influencing both psychological theorisation, and new filming techniques. Jeremy Blatter explains how Harvard psychologist Hugo Münsterberg created early films specifically designed to engage audiences using psychological tactics. Scott Curtis’ article examines how Yale psychologist Arnold Gesell was able to extract scientific data from a film. Felix Rietmann’s article explores a collection of infant observation films from the 1930s and 1960s and how they developed unique narratives of mothers’ engagement with their children that did not necessarily match up with dominant scientific theories. Janet Harbord's article considers how a trilogy of films made at the Maudsley Hospital in the 1950s engaged with innovative film-making techniques that captured behaviour as discrete units. Seth Watter further examines how William S. Condon's use of the unique technology of the Bell and Howell 173BD projector in the 1960s created new understandings of human behaviour that could not have been predicted in advance, and which were highly influenced by the technology itself. Finally, Des O’Rawe explores how radical approaches in both anti-psychiatry, and documentary film-making in the 1960s created new opportunities for audiences to engage with different psychological states. All of these developments in film and psychology continue to influence understandings in both these fields to the present day.