Leonard (Melchior) Henny (The Hague, 4 August 1935 – Amsterdam, 17 September 2011) was a Dutch filmmaker, teacher, and writer, known for his socially engaged documentaries, and his pioneering work in the field of visual sociology.
Henny lived and worked in Berlin, Cambridge, Mass, San Francisco, St. Louis, Missouri, Micronesia and Venezuela.
In the 1960s and 1970s, he particular made documentary films focusing on social change, and he was editor of the International Journal of Visual Sociology.
Also he conducted research on the use of film, photography and video in secondary education and he was the author of articles and monographs on audiovisual resources in anthropology and sociology.
In 1978 Henny had started writing on the functions of images in society in a short work, entitled "Film and video in sociology.