 The utilization of solar light for the photoelectrochemical and photocatalytic production of molecular hydrogen from water is a scientific and technical challenge. Semiconductors with suitable properties to promote solar-driven water splitting are a disoderatum. A hitherto rarely investigated group of semiconductors are ferrites with the empirical formula MFE204 and related compounds. This contribution summarizes the published results of the experimental investigations on the photoelectrochemical and photocatalytic properties of these compounds. It will be shown that the potential of this group of compounds in regard to the production of solar hydrogen has not been fully explored yet. This article was authored by Ralph Dillert, D-Rage H. Taffa, Michael Wark, and others.