Gustav Friedrich Waagen was a German art historian. His opinions were greatly respected in England, where he was invited to give evidence before the royal commission inquiring into the condition and future of the National Gallery, for which he was a leading candidate to become director. He died on a visit to Copenhagen in 1868.
Gustav Glogau was a German philosopher of religion and an academic. He worked for the Technical College (1881-1883) in Zurich as a private tutor and, later, ordinarius, teaching philosophy and pedagogy subjects. He taught as a professor at the Halle University (1883-), Kiel University (1884-).
Gustáv Husák was a Slovak politician who served as the long-time First Secretary of the Communist Party of Czechoslovakia from 1969 to 1987 and the President of Czechoslovakia from 1975 to 1989.
Gustav Kafka was an Austrian philosopher, psychologist. One of Kafka's most outstanding contributions to the realms of psychology have been his critique of fundamentals and methods, such as his criticism of behaviorism, and other articles in which he revealed new points of view based on concrete investigation.
Gustav Karpeles (11 November 1848 in Ivanovice na Hané, Margraviate of Moravia – 21 July 1909 in Nauheim) was a German Jewish historian of literature and editor; son of Elijah Karpeles.
Gustav Kastropp was a German poet, librettist and musician. Kastropp's texts were used by composers such as Georg Schumann, Eugen d'Albert and Bernhard Stavenhagen.