Gerhart is a surname and given name. Notable people with the name include:
- Gerhart Baum (born 1932), German politician and former Federal Minister of the Interior
- Gerhart Eisler (1897–1968), German communist politician
- Gerhart Friedlander (1916–2009), nuclear chemist who worked on the Manhattan Project
- Gerhart Hauptmann (1882–1946), German dramatist and Nobel Prize winner
- Gerhart Jander (1892–1961), German inorganic chemist
- Gerhart Lüders (1920–1995), German theoretical physicist
- Gerhart M. Riegner (1911–2001), sender of the Riegner Telegram (the first official communication of the planned Holocaust) and secretary-general of the World Jewish Congress
- Gerhart Schirmer (1913–2004), highly decorated German soldier of World War II