The study examines the notion of God in Mark's Gospel using diachronic and synchronic methods. It is developed with reference to the relationship of God to the Christ, to history and to the Torah and elaborated with the aid of questions about God's goodness and his responsibility for evil and about the way the First Commandment is dealt with. The study sees itself as an overall interpretation of Mark's Gospel and helps to locate it in the history of religion and in theology.